Bump walkdir from 2.4.0 to 2.5.0 (#5135)

Bumps [walkdir](https://github.com/BurntSushi/walkdir) from 2.4.0 to
2.5.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/BurntSushi/walkdir/commit/4f26be4d450910916ea11533b2efc52b9a6483bc"><code>4f26be4</code></a>
2.5.0</li>
<li><a
href="https://github.com/BurntSushi/walkdir/commit/3be5734033b20c2476e6ca9154c3bb0e0ed840b2"><code>3be5734</code></a>
api: implement <code>FusedIterator</code></li>
<li><a
href="https://github.com/BurntSushi/walkdir/commit/b0d16b759a59836756f8d0ec637f7f8d121a48cd"><code>b0d16b7</code></a>
ci: fix it</li>
<li>See full diff in <a
href="https://github.com/BurntSushi/walkdir/compare/2.4.0...2.5.0">compare
view</a></li>
</ul>
</details>
<br />


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