Bump coverage from 7.8.0 to 7.8.1 (aio-libs#10926)

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.8.0 to
7.8.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst">coverage's
changelog</a>.</em></p>
<blockquote>
<h2>Version 7.8.1 — 2025-05-21</h2>
<ul>
<li>
<p>A number of EncodingWarnings were fixed that could appear if you've
enabled
PYTHONWARNDEFAULTENCODING, fixing <code>issue 1966</code><em>. Thanks,
<code>Henry Schreiner &lt;pull 1967_&gt;</code></em>.</p>
</li>
<li>
<p>Fixed a race condition when using sys.monitoring with free-threading
Python,
closing <code>issue 1970</code>_.</p>
</li>
</ul>
<p>.. _issue 1966: <a
href="https://redirect.github.com/nedbat/coveragepy/issues/1966">nedbat/coveragepy#1966</a>
.. _pull 1967: <a
href="https://redirect.github.com/nedbat/coveragepy/pull/1967">nedbat/coveragepy#1967</a>
.. _issue 1970: <a
href="https://redirect.github.com/nedbat/coveragepy/issues/1970">nedbat/coveragepy#1970</a></p>
<p>.. _changes_7-8-0:</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/nedbat/coveragepy/commit/ed98b8708ccc380bcb1490cd73b3e476f69c234f"><code>ed98b87</code></a>
docs: sample HTML for 7.8.1</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/b98bc9b9878ff8c23bcaa0d7c5b2a55269c6783f"><code>b98bc9b</code></a>
docs: prep for 7.8.1</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/ecbd4daf401664bbabcbb1e954855b0dbe92878e"><code>ecbd4da</code></a>
build: make a step more explicit</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/277441030e56ff14dc1f6612cd3a5771353ef28a"><code>2774410</code></a>
test: simplify skipper, and make it suppressable</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/8b9cecc43a8f2491b3d63f549cc3809a9f2b2b24"><code>8b9cecc</code></a>
fix: close a sys.monitoring race condition with free-threading. <a
href="https://redirect.github.com/nedbat/coveragepy/issues/1970">#1970</a></li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/66e4f8d9ad61e3100af263011a89cbbe476970eb"><code>66e4f8d</code></a>
test: try to unflake a test</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/9975d0c8df66ddbf61bf783c11691b59bd377dfe"><code>9975d0c</code></a>
build: no need for a separate doc_upgrade target</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/6dec28bb8fa0a1875b9c5646f4ca5145cbdfc2fb"><code>6dec28b</code></a>
build: delete unused code in igor.py</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/6376e358f05d3749dfcb12907904c2761f331195"><code>6376e35</code></a>
build: clarify a .ignore rule</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/9bdf3665853eb19211e5ca6cb844a426455cdf24"><code>9bdf366</code></a>
chore: make upgrade doc_upgrade</li>
<li>Additional commits viewable in <a
href="https://github.com/nedbat/coveragepy/compare/7.8.0...7.8.1">compare
view</a></li>
</ul>
</details>
<br />


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requirements/constraints.txt

@@ -52,7 +52,7 @@ click==8.1.8
     #   slotscheck
     #   towncrier
     #   wait-for-it
-coverage==7.8.0
+coverage==7.8.1
     # via
     #   -r requirements/test.in
     #   pytest-cov

requirements/dev.txt

@@ -52,7 +52,7 @@ click==8.1.8
     #   slotscheck
     #   towncrier
     #   wait-for-it
-coverage==7.8.0
+coverage==7.8.1
     # via
     #   -r requirements/test.in
     #   pytest-cov

requirements/test.txt

@@ -25,7 +25,7 @@ cffi==1.17.1
     #   pytest-codspeed
 click==8.1.8
     # via wait-for-it
-coverage==7.8.0
+coverage==7.8.1
     # via
     #   -r requirements/test.in
     #   pytest-cov