Bumps [pymdown-extensions](https://github.com/facelessuser/pymdown-extensions) from 10.20 to 10.21.3. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/facelessuser/pymdown-extensions/releases">pymdown-extensions's releases</a>.</em></p> <blockquote> <h2>10.21.3</h2> <ul> <li><strong>FIX</strong>: Fix regression that allows a snippet to be loaded outside of the base path using directory traversal when <code>restrict_base_path</code> is enabled (the default). Found by <a href="https://github.com/gistrec"><code>@gistrec</code></a>.</li> </ul> <h2>10.21. 2</h2> <h2>10.21.2</h2> <ul> <li><strong>FIX</strong>: Highlight: Latest Pygments versions cannot handle a "filename" for code block titles of <code>None</code>.</li> </ul> <h2>10.20.1</h2> <ul> <li><strong>FIX</strong>: Quotes: Ensure the first class for callouts (the alert type) is always rendered lowercase.</li> </ul> <h2>10.21</h2> <ul> <li><strong>NEW</strong>: Caption: Add support for specifying not only IDs but classes and arbitrary attributes. Initial work by <a href="https://github.com/joapuiib"><code>@joapuiib</code></a>.</li> <li><strong>FIX</strong>: MagicLink: Fix a matching pattern for Bitbucket repo.</li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/facelessuser/pymdown-extensions/commit/42628414c6591b1a1ce211157090783e3b2242d6"><code>4262841</code></a> Fix spelling</li> <li><a href="https://github.com/facelessuser/pymdown-extensions/commit/63b7835776d703d6c339cf2110d9888f676efc0c"><code>63b7835</code></a> Merge commit from fork</li> <li><a href="https://github.com/facelessuser/pymdown-extensions/commit/3d185501daaa1424c4a8d42124112c44ef6ab635"><code>3d18550</code></a> Docs: update js deps</li> <li><a href="https://github.com/facelessuser/pymdown-extensions/commit/a4fdd73554706877e339692183b9424e8f5fec24"><code>a4fdd73</code></a> Skip tag 10.21.1 has we accidentally already used it</li> <li><a href="https://github.com/facelessuser/pymdown-extensions/commit/8afb4cde8fa5159e4318ab72e2daa55fd1107d4f"><code>8afb4cd</code></a> Docs: Update JS deps</li> <li><a href="https://github.com/facelessuser/pymdown-extensions/commit/7bf5b2965a6b3dc6ee502ad3d117f6182e838e56"><code>7bf5b29</code></a> Pygments needs a non-None value for code block title (<a href="https://redirect.github.com/facelessuser/pymdown-extensions/issues/2863">#2863</a>)</li> <li><a href="https://github.com/facelessuser/pymdown-extensions/commit/20b11ebc86b54fbbed3d43e6f1d845ee474b2378"><code>20b11eb</code></a> Fix some spelling and formatting</li> <li><a href="https://github.com/facelessuser/pymdown-extensions/commit/c9edba3301e321e1e0f830a74a01ccbf10a45786"><code>c9edba3</code></a> Docs: strengthen Snippets warning and add security considerations</li> <li><a href="https://github.com/facelessuser/pymdown-extensions/commit/6d92b6878f8d55fd8843a58dd6634cfdfb6df722"><code>6d92b68</code></a> Bump version</li> <li><a href="https://github.com/facelessuser/pymdown-extensions/commit/baeca0e10c5beca4d81fe782058f24b7eb9bf5ff"><code>baeca0e</code></a> Docs: update JS deps</li> <li>Additional commits viewable in <a href="https://github.com/facelessuser/pymdown-extensions/compare/10.20...10.21.3">compare view</a></li> </ul> </details> <br /> [![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=pymdown-extensions&package-manager=uv&previous-version=10.20&new-version=10.21.3)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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