Bump walkdir from 2.3.3 to 2.4.0 (#2910)

Bumps [walkdir](https://github.com/BurntSushi/walkdir) from 2.3.3 to
2.4.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/BurntSushi/walkdir/commit/037c5e16ec4d8b3eacb51f077cfdab7a356e8412"><code>037c5e1</code></a>
2.4.0</li>
<li><a
href="https://github.com/BurntSushi/walkdir/commit/dcc527d8326fae4272b66bb55f433a302a8cad6f"><code>dcc527d</code></a>
api: add follow_root_links() option to WalkDir</li>
<li><a
href="https://github.com/BurntSushi/walkdir/commit/61a185fe49df24966acdec732f5a4b44a0475031"><code>61a185f</code></a>
ci: use latest OS versions</li>
<li>See full diff in <a
href="https://github.com/BurntSushi/walkdir/compare/2.3.3...2.4.0">compare
view</a></li>
</ul>
</details>
<br />


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