minor: Fix pytest instructions in the README

[nuno-faria]

Which issue does this PR close?

N/A.

Rationale for this change

When following the pytest instructions in the README, I got the following error (Ubuntu 24):

======================================================================= test session starts ========================================================================
platform linux -- Python 3.14.3, pytest-8.3.4, pluggy-1.5.0
rootdir: /datafusion-python
configfile: pyproject.toml
plugins: asyncio-0.25.3
asyncio: mode=Mode.AUTO, asyncio_default_fixture_loop_scope=function
collected 0 items / 3 errors
Usage: /datafusion-python/.venv/bin/pytest exclude_globs.lst rat_report.xml
INTERNALERROR> Traceback (most recent call last):
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/main.py", line 283, in wrap_session
INTERNALERROR>     session.exitstatus = doit(config, session) or 0
INTERNALERROR>                          ~~~~^^^^^^^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/main.py", line 336, in _main
INTERNALERROR>     config.hook.pytest_collection(session=session)
INTERNALERROR>     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/pluggy/_hooks.py", line 513, in __call__
INTERNALERROR>     return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
INTERNALERROR>            ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/pluggy/_manager.py", line 120, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>            ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/pluggy/_callers.py", line 139, in _multicall
INTERNALERROR>     raise exception.with_traceback(exception.__traceback__)
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/pluggy/_callers.py", line 122, in _multicall
INTERNALERROR>     teardown.throw(exception)  # type: ignore[union-attr]
INTERNALERROR>     ~~~~~~~~~~~~~~^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/logging.py", line 790, in pytest_collection
INTERNALERROR>     return (yield)
INTERNALERROR>             ^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/pluggy/_callers.py", line 122, in _multicall
INTERNALERROR>     teardown.throw(exception)  # type: ignore[union-attr]
INTERNALERROR>     ~~~~~~~~~~~~~~^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/warnings.py", line 121, in pytest_collection
INTERNALERROR>     return (yield)
INTERNALERROR>             ^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/pluggy/_callers.py", line 122, in _multicall
INTERNALERROR>     teardown.throw(exception)  # type: ignore[union-attr]
INTERNALERROR>     ~~~~~~~~~~~~~~^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/config/__init__.py", line 1417, in pytest_collection
INTERNALERROR>     return (yield)
INTERNALERROR>             ^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/pluggy/_callers.py", line 103, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/main.py", line 347, in pytest_collection
INTERNALERROR>     session.perform_collect()
INTERNALERROR>     ~~~~~~~~~~~~~~~~~~~~~~~^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/main.py", line 809, in perform_collect
INTERNALERROR>     self.items.extend(self.genitems(node))
INTERNALERROR>     ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/main.py", line 975, in genitems
INTERNALERROR>     yield from self.genitems(subnode)
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/main.py", line 975, in genitems
INTERNALERROR>     yield from self.genitems(subnode)
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/main.py", line 975, in genitems
INTERNALERROR>     yield from self.genitems(subnode)
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/main.py", line 970, in genitems
INTERNALERROR>     rep, duplicate = self._collect_one_node(node, handle_dupes)
INTERNALERROR>                      ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/main.py", line 835, in _collect_one_node
INTERNALERROR>     rep = collect_one_node(node)
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/runner.py", line 567, in collect_one_node
INTERNALERROR>     rep: CollectReport = ihook.pytest_make_collect_report(collector=collector)
INTERNALERROR>                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/pluggy/_hooks.py", line 513, in __call__
INTERNALERROR>     return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
INTERNALERROR>            ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/pluggy/_manager.py", line 120, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>            ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/pluggy/_callers.py", line 139, in _multicall
INTERNALERROR>     raise exception.with_traceback(exception.__traceback__)
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/pluggy/_callers.py", line 122, in _multicall
INTERNALERROR>     teardown.throw(exception)  # type: ignore[union-attr]
INTERNALERROR>     ~~~~~~~~~~~~~~^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/capture.py", line 860, in pytest_make_collect_report
INTERNALERROR>     rep = yield
INTERNALERROR>           ^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/pluggy/_callers.py", line 103, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/runner.py", line 391, in pytest_make_collect_report
INTERNALERROR>     call = CallInfo.from_call(
INTERNALERROR>         collect, "collect", reraise=(KeyboardInterrupt, SystemExit)
INTERNALERROR>     )
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/runner.py", line 341, in from_call
INTERNALERROR>     result: TResult | None = func()
INTERNALERROR>                              ~~~~^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/runner.py", line 389, in collect
INTERNALERROR>     return list(collector.collect())
INTERNALERROR>                 ~~~~~~~~~~~~~~~~~^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/pytest_asyncio/plugin.py", line 738, in _patched_collect
INTERNALERROR>     module = collector.obj
INTERNALERROR>              ^^^^^^^^^^^^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/python.py", line 284, in obj
INTERNALERROR>     self._obj = obj = self._getobj()
INTERNALERROR>                       ~~~~~~~~~~~~^^
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/python.py", line 546, in _getobj
INTERNALERROR>     return importtestmodule(self.path, self.config)
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/python.py", line 493, in importtestmodule
INTERNALERROR>     mod = import_path(
INTERNALERROR>         path,
INTERNALERROR>     ...<2 lines>...
INTERNALERROR>         consider_namespace_packages=config.getini("consider_namespace_packages"),
INTERNALERROR>     )
INTERNALERROR>   File "/datafusion-python/.venv/lib/python3.14/site-packages/_pytest/pathlib.py", line 587, in import_path
INTERNALERROR>     importlib.import_module(module_name)
INTERNALERROR>     ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
INTERNALERROR>   File "/root/.local/share/uv/python/cpython-3.14.3-linux-x86_64-gnu/lib/python3.14/importlib/__init__.py", line 88, in import_module
INTERNALERROR>     return _bootstrap._gcd_import(name[level:], package, level)
INTERNALERROR>            ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
INTERNALERROR>   File "<frozen importlib._bootstrap>", line 1398, in _gcd_import
INTERNALERROR>   File "<frozen importlib._bootstrap>", line 1371, in _find_and_load
INTERNALERROR>   File "<frozen importlib._bootstrap>", line 1342, in _find_and_load_unlocked
INTERNALERROR>   File "<frozen importlib._bootstrap>", line 938, in _load_unlocked
INTERNALERROR>   File "<frozen importlib._bootstrap_external>", line 759, in exec_module
INTERNALERROR>   File "<frozen importlib._bootstrap>", line 491, in _call_with_frames_removed
INTERNALERROR>   File "/datafusion-python/dev/release/check-rat-report.py", line 28, in <module>
INTERNALERROR>     sys.exit(1)
INTERNALERROR>     ~~~~~~~~^^^
INTERNALERROR> SystemExit: 1
mainloop: caught unexpected SystemExit!

======================================================================== 3 errors in 0.14s =========================================================================

The solution is to remove the dot in the uv run --no-project pytest command.

What changes are included in this PR?

Minor change to the README.

Are there any user-facing changes?

No.

[timsaucer]

Thanks!