chore(deps-dev): Update mkdocs-material requirement from ~=9.6.5 to ~=9.6.7 in /gh-pages (#4783)

Updates the requirements on [mkdocs-material](https://github.com/squidfunk/mkdocs-material) to permit the latest version.
<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-9.6.7</h2>
<ul>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8056">#8056</a>: Error in backrefs implementation (9.6.6 regression)</li>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8054">#8054</a>: Unescaped quotes in ARIA labels of table of contents</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-9.6.7 (2025-03-03)</p>
<ul>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8056">#8056</a>: Error in backrefs implementation (9.6.6 regression)</li>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8054">#8054</a>: Unescaped quotes in ARIA labels of table of contents</li>
</ul>
<p>mkdocs-material-9.6.6 (2025-03-01)</p>
<ul>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8040">#8040</a>: Privacy plugin not replacing exteral assets (9.6.5 regression)</li>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8031">#8031</a>: Replace unmtaintained regex package in search plugin</li>
</ul>
<p>mkdocs-material-9.6.5 (2025-02-20)</p>
<ul>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8016">#8016</a>: Tags listing not showing when when file name has spaces</li>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8012">#8012</a>: Privacy plugin crashes if HTTP download fails</li>
</ul>
<p>mkdocs-material-9.6.4 (2025-02-12)</p>
<ul>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/7985">#7985</a>: Blog content sometimes not stretching to full width</li>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/7978">#7978</a>: Navigation rendering bug in Safari 18.3</li>
</ul>
<p>mkdocs-material-9.6.3 (2025-02-07)</p>
<ul>
<li>Fixed rendering of arrow heads in Mermaid.js class diagrams</li>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/7960">#7960</a>: Tags plugin crashes on numeric metadata titles</li>
</ul>
<p>mkdocs-material-9.6.2 (2025-02-03)</p>
<ul>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/7955">#7955</a>: Excessively long words don't break on narrow screens</li>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/7947">#7947</a>: Scope setting interferes with outdated version banner</li>
</ul>
<p>mkdocs-material-9.6.1 (2025-01-31)</p>
<ul>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/7943">#7943</a>: Tags plugin crashing due to merge error</li>
</ul>
<p>mkdocs-material-9.6.0 (2025-01-31)</p>
<ul>
<li>Added meta plugin</li>
<li>Rewrite of the tags plugin</li>
<li>Added support for allow lists in tags plugin</li>
<li>Added support for and custom sorting in tags plugin</li>
<li>Added support for related links in blog plugin</li>
<li>Added support for custom index pages in blog plugin</li>
<li>Added support for navigation subtitles</li>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/7924">#7924</a>: Anchors might require two clicks when using instant navigation</li>
</ul>
<p>mkdocs-material-9.5.50 (2025-01-18)</p>
<ul>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/7913">#7913</a>: Social plugin renders attribute lists in page title</li>
</ul>
<p>mkdocs-material-9.5.49+insiders-4.53.15 (2025-01-15)</p>

</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/85ac2144f5e18c1e0a4d699262c29085adad74cf"><code>85ac214</code></a> Prepare 9.6.7 release</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/e0b0113574b323d45dd73523b8ac0c153b2427e0"><code>e0b0113</code></a> Fixed backref import (<a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8057">#8057</a>)</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/6a496186ffff6043c244791cbe094b92b9b02247"><code>6a49618</code></a> Added distribution files</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/27ba95652ab80c2a0210973873b2867674983531"><code>27ba956</code></a> Fixed unescaped of quotes in ARIA labels (<a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8053">#8053</a>)</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/922cb7cea295310c63ae623d350114e0df608734"><code>922cb7c</code></a> Prepare 9.6.6 release</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/523922b3837ca974346a012191991d89f4030f68"><code>523922b</code></a> Fixed privacy plugin not replacing occurrences</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/3bd81bdc6667b146390043ee9abd39f9449cb903"><code>3bd81bd</code></a> Updated dependencies</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/b6e40de116b106752827a2132fc5c8e88850cf9a"><code>b6e40de</code></a> Updated dependencies</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/3a7cc2a70124c0d30b461bb07136cd9e2028fa3c"><code>3a7cc2a</code></a> Lowered backref version to support Py3.8 (<a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8037">#8037</a>)</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/ab1511074c6eb03063b9258e8e42a117a57f5853"><code>ab15110</code></a> Replaced regex with backrefs package in search plugin (<a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8034">#8034</a>)</li>
<li>Additional commits viewable in <a href="https://github.com/squidfunk/mkdocs-material/compare/9.6.5...9.6.7">compare view</a></li>
</ul>
</details>
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gh-pages/requirements-dev.txt

@@ -1,4 +1,4 @@
 mkdocs~=1.6.1
 mkdocs-awesome-pages-plugin~=2.10.1
-mkdocs-material~=9.6.5
+mkdocs-material~=9.6.7
 mkdocs-git-revision-date-plugin~=0.3.2