Bump sphinx from 8.2.1 to 8.2.3 in /docs (#132)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 8.2.1 to
8.2.3.
<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 8.2.3</h2>
<p>Changelog: <a
href="https://www.sphinx-doc.org/en/master/changes/8.2.html">https://www.sphinx-doc.org/en/master/changes/8.2.html</a></p>
<h2>Sphinx 8.2.2</h2>
<p>Changelog: <a
href="https://www.sphinx-doc.org/en/master/changes/8.2.html">https://www.sphinx-doc.org/en/master/changes/8.2.html</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/847ad0c991e21db9daa02fec09acbd456f353300"><code>847ad0c</code></a>
Bump to 8.2.3 final</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/4091fe335444236181f765adaf9e9bf0a2bcc735"><code>4091fe3</code></a>
Add CHANGES for Sphinx 8.2.3</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/c84c21ff935e840f67413e9397fc6a75cb87e529"><code>c84c21f</code></a>
Correct the date for Sphinx 8.2.2</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/b3881bb23471584d3999ecbb03cb20184da22738"><code>b3881bb</code></a>
Fix _CurrentDocument membership testing with
'{c,cpp}:parent_symbol'</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/92b5303219101dee99ca50c245c5eb65257d4580"><code>92b5303</code></a>
Define <code>_StrPath.__radd__()</code></li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/5739a9d58d2e5005259718d615d4c8ec3971173a"><code>5739a9d</code></a>
Bump version</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/ee96ef304265d9969488f7bcd09b37826ac7c43c"><code>ee96ef3</code></a>
Bump to 8.2.2 final</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/3e0021c7aa4e1f1b91d035d10b5f0b3a66b4f206"><code>3e0021c</code></a>
Move Sphinx 8.2.2 CHANGES to doc/changes</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/1a62f3170ad7f2fe3f1f1bfc1d22e0e402e8e274"><code>1a62f31</code></a>
Fix apidoc extension not setting default header/package name (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/13391">#13391</a>)</li>
<li><a
href="https://github.com/sphinx-doc/sphinx/commit/13d2899666c9e492809adb690b9a66f7f7064ce6"><code>13d2899</code></a>
Replace <code>None</code> filename with <code>''</code> in
<code>Sphinx.add_js_file()</code> (<a
href="https://redirect.github.com/sphinx-doc/sphinx/issues/13402">#13402</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/sphinx-doc/sphinx/compare/v8.2.1...v8.2.3">compare
view</a></li>
</ul>
</details>
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docs/requirements.txt

@@ -1,3 +1,3 @@
 python-decouple==3.8
-Sphinx==8.2.1
+Sphinx==8.2.3
 sphinx-rtd-theme==3.0.2