Build: Bump coverage from 7.8.2 to 7.9.1 (apache#2106)

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.8.2 to
7.9.1.
<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 7.9.1 — 2025-06-13</h2>
<ul>
<li>
<p>The &quot;no-ctracer&quot; warning is not issued for Python
pre-release versions.
Coverage doesn't ship compiled wheels for those versions, so this was
far too
noisy.</p>
</li>
<li>
<p>On Python 3.14+, the &quot;sysmon&quot; core is now the default if
it's supported for
your configuration. Plugins and dynamic contexts are still not supported
with it.</p>
</li>
</ul>
<p>.. _changes_7-9-0:</p>
<h2>Version 7.9.0 — 2025-06-11</h2>
<ul>
<li>
<p>Added a <code>[run] core</code> configuration setting to specify the
measurement core,
which was previously only available through the COVERAGE_CORE
environment
variable. Finishes <code>issue 1746</code>_.</p>
</li>
<li>
<p>Fixed incorrect rendering of f-strings with doubled braces, closing
<code>issue 1980</code>_.</p>
</li>
<li>
<p>If the C tracer core can't be imported, a warning
(&quot;no-ctracer&quot;) is issued
with the reason.</p>
</li>
<li>
<p>The C tracer core extension module now conforms to <code>PEP
489</code><em>, closing <code>issue 1977</code></em>. Thanks, <code>Adam
Turner &lt;pull 1978_&gt;</code>_.</p>
</li>
<li>
<p>Fixed a &quot;ValueError: min() arg is an empty sequence&quot; error
caused by strange
empty modules, found by <code>oss-fuzz</code>_.</p>
</li>
</ul>
<p>.. _issue 1746: <a
href="https://redirect.github.com/nedbat/coveragepy/issues/1746">nedbat/coveragepy#1746</a>
.. _issue 1977: <a
href="https://redirect.github.com/nedbat/coveragepy/issues/1977">nedbat/coveragepy#1977</a>
.. _pull 1978: <a
href="https://redirect.github.com/nedbat/coveragepy/pull/1978">nedbat/coveragepy#1978</a>
.. _issue 1980: <a
href="https://redirect.github.com/nedbat/coveragepy/issues/1980">nedbat/coveragepy#1980</a>
.. _PEP 489: <a
href="https://peps.python.org/pep-0489">https://peps.python.org/pep-0489</a>
.. _oss-fuzz: <a
href="https://google.github.io/oss-fuzz/">https://google.github.io/oss-fuzz/</a></p>
<p>.. _changes_7-8-2:</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/nedbat/coveragepy/commit/4fa1b717978c2d9e40636a10363b618e152f4c4e"><code>4fa1b71</code></a>
docs: sample HTML for 7.9.1</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/5cf757b42d1649ccbc74488471ab9270cb7d99f2"><code>5cf757b</code></a>
docs: prep for 7.9.1</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/bea6204982b75f6a20f5afbf3534bd3776e126dd"><code>bea6204</code></a>
fix: better defaulting of core</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/7795441563fb0afe9439a857a5e0df50336f73dd"><code>7795441</code></a>
fix: fewer warnings, default to sys.monitoring on 3.14+</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/18aa07456965c7d26e028aebaf825b96b7638d74"><code>18aa074</code></a>
fix: some custom builds don't have <strong>file</strong></li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/8c5bf659f4b4412685a828c01870cfc9a23186ac"><code>8c5bf65</code></a>
chore: make upgrade</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/128c4f4e452f08e52fe1d6fbebb8392ae2dc7297"><code>128c4f4</code></a>
build: bump version to 7.9.1</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/452d86ffa16cd0c1b729c7d206f59bc1010aee94"><code>452d86f</code></a>
docs: sample HTML for 7.9.0</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/a670927ae6d248f369d54fbe22d9546b6a25c25e"><code>a670927</code></a>
docs: prep for 7.9.0</li>
<li><a
href="https://github.com/nedbat/coveragepy/commit/3b0cb870f6abac8e4a7607094c467a7d766a44f4"><code>3b0cb87</code></a>
build: windows 3.14 is fixed</li>
<li>Additional commits viewable in <a
href="https://github.com/nedbat/coveragepy/compare/7.8.2...7.9.1">compare
view</a></li>
</ul>
</details>
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