chore(deps-dev): Update mkdocs-material requirement from ~=9.7.6 to ~=9.7.7 in /gh-pages (#5211)

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-9.7.7</h2>
<blockquote>
<p>[!WARNING]</p>
<p><strong>Material for MkDocs is approaching end of life</strong></p>
<p>Material for MkDocs is scheduled to reach end of life on November 5, 2026. Until then, maintenance is limited to critical bug fixes and security updates.</p>
<p>The path forward is <a href="https://zensical.org">Zensical</a>, our next-generation static site generator built from first principles. If you’re planning a new documentation project or thinking about your long-term setup, we encourage you to start exploring Zensical.</p>
<p>Organizations requiring support beyond this date can <a href="https://github.com/squidfunk/mkdocs-material/blob/HEAD/mailto:hello@zensical.org">get in touch</a> to discuss options.</p>
<p><a href="https://squidfunk.github.io/mkdocs-material/blog/2025/11/05/zensical/">Read the full announcement on our blog</a></p>
</blockquote>
<h2>Changes</h2>
<ul>
<li>Fixed a DOM-based XSS vulnerability in search suggestions</li>
</ul>
<blockquote>
<p>Thanks to <a href="https://github.com/p"><code>@​p</code></a>- for responsibly reporting this issue.</p>
</blockquote>
</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-9.7.7 (2026-07-17)</p>
<ul>
<li>Fixed DOM-based XSS vulnerability in search suggestions</li>
</ul>
<p>mkdocs-material-9.7.6 (2026-03-19)</p>
<ul>
<li>Automatically disable MkDocs 2.0 warning for forks of MkDocs</li>
</ul>
<p>mkdocs-material-9.7.5 (2026-03-10)</p>
<ul>
<li>Limited version range of mkdocs to &lt;2</li>
<li>Updated MkDocs 2.0 incompatibility warning (clarify relation with MkDocs)</li>
</ul>
<p>mkdocs-material-9.7.4 (2026-03-03)</p>
<ul>
<li>Hardened social cards plugin by switching to sandboxed environment</li>
<li>Updated MkDocs 2.0 incompatibility warning</li>
</ul>
<p>mkdocs-material-9.7.3 (2026-02-24)</p>
<ul>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8567">#8567</a>: Print MkDocs 2.0 incompatibility warning to stderr</li>
</ul>
<p>mkdocs-material-9.7.2 (2026-02-18)</p>
<ul>
<li>Opened up version ranges of optional dependencies for forward-compatibility</li>
<li>Added warning to 'mkdocs build' about impending MkDocs 2.0 incompatibility</li>
</ul>
<p>mkdocs-material-9.7.1 (2025-12-18)</p>
<ul>
<li>Updated requests to 2.30+ to mitigate CVE in urllib</li>
<li>Fixed privacy plugin not picking up protocol-relative URLs</li>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8542">#8542</a>: false positives and negatives captured in privacy plugin</li>
</ul>
<p>mkdocs-material-9.7.0 (2025-11-11)</p>
<p>⚠️ Material for MkDocs is now in maintenance mode</p>
<p>This is the last release of Material for MkDocs that will receive new features.
Going forward, the Material for MkDocs team focuses on Zensical, a next-gen
static site generator built from first principles. We will provide critical
bug fixes and security updates for Material for MkDocs for 12 months at least.</p>
<p>Read the full announcement on our blog:
<a href="https://squidfunk.github.io/mkdocs-material/blog/2025/11/05/zensical/">https://squidfunk.github.io/mkdocs-material/blog/2025/11/05/zensical/</a></p>
<p>This release includes all features that were previously exclusive to the
Insiders edition. These features are now freely available to everyone.</p>
<p>Note on deprecated plugins: The projects and typeset plugins are included in
this release, but must be considered deprecated. Both plugins proved</p>

</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/b3e6dd886a974aa8200759ecfd7db28c598a2894"><code>b3e6dd8</code></a> Prepare 9.7.7 release</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/52fb6be8aafe326419f34dc94d3211e7bbfbfb25"><code>52fb6be</code></a> Merge commit from fork</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/901e6335cc80b0f12e46a1e34bd85e983dd78a6e"><code>901e633</code></a> Added <code>SECURITY.md</code> with EOL notice</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/5b36f2ac499a45905e246bc66bbee2858ef6556f"><code>5b36f2a</code></a> Bump js-yaml from 4.1.1 to 4.2.0 (<a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8598">#8598</a>)</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/2d11e7bc92c59b86d6ac0da2e38044fb4befa6e0"><code>2d11e7b</code></a> Bump form-data from 3.0.4 to 3.0.5 (<a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8597">#8597</a>)</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/ae05a534a8c8e1c58eb6aa55d460d309bcfce22b"><code>ae05a53</code></a> Bump esbuild from 0.27.2 to 0.28.1 (<a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8596">#8596</a>)</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/434af93166e5b90b78bba1295ca5a140fc67d0bc"><code>434af93</code></a> Bump shell-quote from 1.7.3 to 1.8.4 (<a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8593">#8593</a>)</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/4447cdadcbe8bc82570e9f1ae2b970f461b03b68"><code>4447cda</code></a> Documentation (<a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8590">#8590</a>)</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/8f8d551c9c5296dfc2a5ede35047bfb491d66bc9"><code>8f8d551</code></a> Updated copyright year (<a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8588">#8588</a>)</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/08d8514d491782b4ac46673bcfdedb2f6fc85f3d"><code>08d8514</code></a> Bump fast-uri from 3.0.3 to 3.1.2 (<a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8587">#8587</a>)</li>
<li>Additional commits viewable in <a href="https://github.com/squidfunk/mkdocs-material/compare/9.7.6...9.7.7">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~=9.7.6
+mkdocs-material~=9.7.7
 mkdocs-git-revision-date-plugin~=0.3.2