chore(docs): bump mkdocs-material from 9.6.20 to 9.6.21 in /.github/workflows/mkdocs in the python-deps group (#4819)

Bumps the python-deps group in /.github/workflows/mkdocs with 1 update:
[mkdocs-material](https://github.com/squidfunk/mkdocs-material).

Updates `mkdocs-material` from 9.6.20 to 9.6.21
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/squidfunk/mkdocs-material/releases">mkdocs-material's
releases</a>.</em></p>
<blockquote>
<h2>mkdocs-material-9.6.21</h2>
<ul>
<li>Updated Serbian translations</li>
<li>Fixed <a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8458">#8458</a>:
Temporary pin of click dependency</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG">mkdocs-material's
changelog</a>.</em></p>
<blockquote>
<p>mkdocs-material-9.6.21 (2025-09-30)</p>
<ul>
<li>Updated Serbian translations</li>
<li>Fixed <a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8458">#8458</a>:
Temporary pin of click dependency</li>
</ul>
<p>mkdocs-material-9.6.20 (2025-09-15)</p>
<ul>
<li>Fixed <a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8446">#8446</a>:
Deprecation warning as of Python 3.14 in Emoji extension</li>
<li>Fixed <a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8440">#8440</a>:
<code>&amp;</code> character not escaped in search highlighting</li>
<li>Fixed <a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8439">#8439</a>:
FontAwesome icons color not set in social cards (regression)</li>
</ul>
<p>mkdocs-material-9.6.19 (2025-09-07)</p>
<ul>
<li>Added support for Python 3.14</li>
<li>Updated Bahasa Malaysia translations</li>
</ul>
<p>mkdocs-material-9.6.18 (2025-08-22)</p>
<ul>
<li>Updated Azerbaijani translations</li>
<li>Fixed last compat issues with [minijinja], now 100% compatible</li>
</ul>
<p>mkdocs-material-9.6.17 (2025-08-15)</p>
<ul>
<li>Fixed <a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8396">#8396</a>:
Videos do not autoplay when inside a content tab</li>
<li>Fixed <a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8394">#8394</a>:
Stroke width not effective in Mermaid.js diagrams</li>
<li>Fixed disappearing version selector when hiding page title</li>
</ul>
<p>mkdocs-material-9.6.16 (2025-07-26)</p>
<ul>
<li>Fixed <a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8349">#8349</a>:
Info plugin doesn't correctly detect virtualenv in some cases</li>
<li>Fixed <a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8334">#8334</a>:
Find-in-page detects matches in hidden search result list</li>
</ul>
<p>mkdocs-material-9.6.15 (2025-07-01)</p>
<ul>
<li>Updated Mongolian translations</li>
<li>Improved semantic markup of &quot;edit this page&quot; button</li>
<li>Improved info plugin virtual environment resolution</li>
<li>Fixed <a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8291">#8291</a>:
Large font size setting throws of breakpoints in JavaScript</li>
</ul>
<p>mkdocs-material-9.6.14 (2025-05-13)</p>
<ul>
<li>Fixed <a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8215">#8215</a>:
Social plugin crashes when CairoSVG is updated to 2.8</li>
</ul>
<p>mkdocs-material-9.6.13 (2025-05-10)</p>
<ul>
<li>Fixed <a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8204">#8204</a>:
Annotations showing list markers in print view</li>
<li>Fixed <a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8153">#8153</a>:
Improve style of cardinality symbols in Mermaid.js ER diagrams</li>
</ul>
<p>mkdocs-material-9.6.12 (2025-04-17)</p>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/squidfunk/mkdocs-material/commit/f7cacc0089c01e6c075512da06de949e769dad0e"><code>f7cacc0</code></a>
Prepare 9.6.21 release</li>
<li><a
href="https://github.com/squidfunk/mkdocs-material/commit/6f715fbe063869d6fda139c0b9f06e371517d106"><code>6f715fb</code></a>
Unpinned click</li>
<li><a
href="https://github.com/squidfunk/mkdocs-material/commit/97e275c953e5b8255ca24ca166ddd802e23d84b1"><code>97e275c</code></a>
Updated Serbian languages (<a
href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8445">#8445</a>)</li>
<li>See full diff in <a
href="https://github.com/squidfunk/mkdocs-material/compare/9.6.20...9.6.21">compare
view</a></li>
</ul>
</details>
<br />


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.github/workflows/mkdocs/requirements.in

@@ -1 +1 @@
-mkdocs-material==9.6.20
+mkdocs-material==9.6.21

.github/workflows/mkdocs/requirements.txt

@@ -118,9 +118,7 @@ charset-normalizer==3.4.2 \
 click==8.2.1 \
     --hash=sha256:27c491cc05d968d271d5a1db13e3b5a184636d9d930f148c50b038f0d0646202 \
     --hash=sha256:61a3265b914e850b85317d0b3109c7f8cd35a670f963866005d6ef1d5175a12b
-    # via
-    #   mkdocs
-    #   mkdocs-material
+    # via mkdocs
 colorama==0.4.6 \
     --hash=sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44 \
     --hash=sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6
@@ -225,9 +223,9 @@ mkdocs-get-deps==0.2.0 \
     --hash=sha256:162b3d129c7fad9b19abfdcb9c1458a651628e4b1dea628ac68790fb3061c60c \
     --hash=sha256:2bf11d0b133e77a0dd036abeeb06dec8775e46efa526dc70667d8863eefc6134
     # via mkdocs
-mkdocs-material==9.6.20 \
-    --hash=sha256:b8d8c8b0444c7c06dd984b55ba456ce731f0035c5a1533cc86793618eb1e6c82 \
-    --hash=sha256:e1f84d21ec5fb730673c4259b2e0d39f8d32a3fef613e3a8e7094b012d43e790
+mkdocs-material==9.6.21 \
+    --hash=sha256:aa6a5ab6fb4f6d381588ac51da8782a4d3757cb3d1b174f81a2ec126e1f22c92 \
+    --hash=sha256:b01aa6d2731322438056f360f0e623d3faae981f8f2d8c68b1b973f4f2657870
     # via -r requirements.in
 mkdocs-material-extensions==1.3.1 \
     --hash=sha256:10c9511cea88f568257f960358a467d12b970e1f7b2c0e5fb2bb48cab1928443 \