Update sphinx requirement from <8.2.0 to <8.3.0 in the actions group

Updates the requirements on [sphinx](https://github.com/sphinx-doc/sphinx) to permit the latest version.

Updates `sphinx` to 8.2.1
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v8.2.1/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v0.1.61611...v8.2.1)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -45,7 +45,7 @@ Tracker = "https://github.com/ipython/ipykernel/issues"
 docs = [
   # Sphinx pinned until `sphinx-autodoc-typehints` issue is resolved:
   # https://github.com/tox-dev/sphinx-autodoc-typehints/issues/523
-  "sphinx<8.2.0",
+  "sphinx<8.3.0",
   "myst_parser",
   "pydata_sphinx_theme",
   "sphinxcontrib_github_alt",