Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 8.2.3 to
9.1.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/sphinx-doc/sphinx/releases">sphinx's
releases</a>.</em></p>
<blockquote>
<h2>Sphinx 9.1.0</h2>
<p>Changelog: <a
href="https://www.sphinx-doc.org/en/master/changes.html">https://www.sphinx-doc.org/en/master/changes.html</a></p>
<h2>Dependencies</h2>
<ul>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14153">#14153</a>:
Drop Python 3.11 support.</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12555">#12555</a>:
Drop Docutils 0.20 support.
Patch by Adam Turner</li>
</ul>
<h2>Features added</h2>
<ul>
<li>Add <code>add_static_dir()</code> for copying static
assets from extensions to the build output.
Patch by Jared Dillard</li>
</ul>
<h2>Bugs fixed</h2>
<ul>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14189">#14189</a>:
autodoc: Fix duplicate <code>:no-index-entry:</code> for modules.
Patch by Adam Turner</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/13713">#13713</a>:
Fix compatibility with MyST-Parser.
Patch by Adam Turner</li>
<li>Fix tests for Python 3.15.
Patch by Adam Turner</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14089">#14089</a>:
autodoc: Fix default option parsing.
Patch by Adam Turner</li>
<li>Remove incorrect static typing assertions.
Patch by Adam Turner</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14050">#14050</a>:
LaTeXTranslator fails to build documents using the &quot;acronym&quot;
standard role.
Patch by Günter Milde</li>
<li>LaTeX: Fix rendering for grid filled merged vertical cell.
Patch by Tim Nordell</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14228">#14228</a>:
LaTeX: Fix overrun footer for cases of merged vertical table cells.
Patch by Tim Nordell</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14207">#14207</a>:
Fix creating <code>HTMLThemeFactory</code> objects in third-party
extensions.
Patch by Adam Turner</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/3099">#3099</a>:
LaTeX: PDF build crashes if a code-block contains more than
circa 1350 codelines (about 27 a4-sized pages at default pointsize).
Patch by Jean-François B.</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14064">#14064</a>:
LaTeX: TABs ending up in sphinxVerbatim fail to obey tab stops.
Patch by Jean-François B.</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14089">#14089</a>:
autodoc: Improve support for non-weakreferencable objects.
Patch by Adam Turner</li>
<li>LaTeX: Fix accidental removal at <code>3.5.0</code> (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/8854">#8854</a>)
of the documentation of
<code>literalblockcappos</code> key of  sphinxsetup.
Patch by Jean-François B.</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst">sphinx's
changelog</a>.</em></p>
<blockquote>
<h1>Release 9.1.0 (released Dec 31, 2025)</h1>
<h2>Dependencies</h2>
<ul>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14153">#14153</a>:
Drop Python 3.11 support.</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/12555">#12555</a>:
Drop Docutils 0.20 support.
Patch by Adam Turner</li>
</ul>
<h2>Features added</h2>
<ul>
<li>Add :meth:<code>~sphinx.application.Sphinx.add_static_dir</code> for
copying static
assets from extensions to the build output.
Patch by Jared Dillard</li>
</ul>
<h2>Bugs fixed</h2>
<ul>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14189">#14189</a>:
autodoc: Fix duplicate <code>:no-index-entry:</code> for modules.
Patch by Adam Turner</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/13713">#13713</a>:
Fix compatibility with MyST-Parser.
Patch by Adam Turner</li>
<li>Fix tests for Python 3.15.
Patch by Adam Turner</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14089">#14089</a>:
autodoc: Fix default option parsing.
Patch by Adam Turner</li>
<li>Remove incorrect static typing assertions.
Patch by Adam Turner</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14050">#14050</a>:
LaTeXTranslator fails to build documents using the &quot;acronym&quot;
standard role.
Patch by Günter Milde</li>
<li>LaTeX: Fix rendering for grid filled merged vertical cell.
Patch by Tim Nordell</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14228">#14228</a>:
LaTeX: Fix overrun footer for cases of merged vertical table cells.
Patch by Tim Nordell</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14207">#14207</a>:
Fix creating <code>HTMLThemeFactory</code> objects in third-party
extensions.
Patch by Adam Turner</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/3099">#3099</a>:
LaTeX: PDF build crashes if a code-block contains more than
circa 1350 codelines (about 27 a4-sized pages at default pointsize).
Patch by Jean-François B.</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14064">#14064</a>:
LaTeX: TABs ending up in sphinxVerbatim fail to obey tab stops.
Patch by Jean-François B.</li>
<li><a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14089">#14089</a>:
autodoc: Improve support for non-weakreferencable objects.
Patch by Adam Turner</li>
<li>LaTeX: Fix accidental removal at <code>3.5.0</code> (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/8854">#8854</a>)
of the documentation of
<code>literalblockcappos</code> key of :ref:<code>'sphinxsetup'
&lt;latexsphinxsetup&gt;</code>.
Patch by Jean-François B.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/cc7c6f435ad37bb12264f8118c8461b230e6830c"><code>cc7c6f4</code></a>
Bump to 9.1.0 final</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/b127b9478aa4654a82eeadf1a1e89715d3927608"><code>b127b94</code></a>
Add <code>app.add_static_dir()</code> for copying extension static files
(<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14219">#14219</a>)</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/20f1c46790d370b50fa7396cca3e1cc658ce9f89"><code>20f1c46</code></a>
LaTeX: Inhibit breaks for rows with merged vertical cells (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14227">#14227</a>)</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/3c85411fd06a1c3026f7991818312e5358ef52e5"><code>3c85411</code></a>
Polish CHANGES.rst (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14225">#14225</a>)</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/9ee5446c6cfb997a6b92f5cfb84d045ec947417a"><code>9ee5446</code></a>
LaTeX: restore 1.7 documentation of literalblockcappos (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14224">#14224</a>)</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/d75d602005be7567abc7741ee777f6f8c302d827"><code>d75d602</code></a>
LaTeX: improve (again...) some code comments in time for 9.1.0 (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14222">#14222</a>)</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/8dca61d69a4a05c56702980e4f6cbe6451dd9ebc"><code>8dca61d</code></a>
Improve some LaTeX code comments (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14220">#14220</a>)</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/8ab960098a8e12b8893bd3ceafc394759118346b"><code>8ab9600</code></a>
Bump to 9.1.0 candidate 2</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/d59b2375945ed04414a11b0adb3e5655525f3e9e"><code>d59b237</code></a>
autodoc: Improve support for non-weakreferencable objects</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/964424b3dbc92ed1718272fd45123878f3eec14d"><code>964424b</code></a>
Use the correct reference for using existing extensions (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/14157">#14157</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/sphinx-doc/sphinx/compare/v8.2.3...v9.1.0">compare
view</a></li>
</ul>
</details>
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