build(deps-dev): bump tornado from 6.4.1 to 6.4.2 (#318)

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.4.1 to
6.4.2.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/tornadoweb/tornado/blob/v6.4.2/docs/releases.rst">tornado's
changelog</a>.</em></p>
<blockquote>
<h1>Release notes</h1>
<p>.. toctree::
:maxdepth: 2</p>
<p>releases/v6.4.2
releases/v6.4.1
releases/v6.4.0
releases/v6.3.3
releases/v6.3.2
releases/v6.3.1
releases/v6.3.0
releases/v6.2.0
releases/v6.1.0
releases/v6.0.4
releases/v6.0.3
releases/v6.0.2
releases/v6.0.1
releases/v6.0.0
releases/v5.1.1
releases/v5.1.0
releases/v5.0.2
releases/v5.0.1
releases/v5.0.0
releases/v4.5.3
releases/v4.5.2
releases/v4.5.1
releases/v4.5.0
releases/v4.4.3
releases/v4.4.2
releases/v4.4.1
releases/v4.4.0
releases/v4.3.0
releases/v4.2.1
releases/v4.2.0
releases/v4.1.0
releases/v4.0.2
releases/v4.0.1
releases/v4.0.0
releases/v3.2.2
releases/v3.2.1
releases/v3.2.0
releases/v3.1.1
releases/v3.1.0
releases/v3.0.2
releases/v3.0.1
releases/v3.0.0
releases/v2.4.1
releases/v2.4.0</p>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/tornadoweb/tornado/commit/a5ecfab15e52202a46d34638aad93cddca86d87b"><code>a5ecfab</code></a>
Bump version to 6.4.2</li>
<li><a
href="https://github.com/tornadoweb/tornado/commit/bc7df6bafdec61155e7bf385081feb205463857d"><code>bc7df6b</code></a>
Fix tests with Twisted 24.7.0</li>
<li><a
href="https://github.com/tornadoweb/tornado/commit/d5ba4a1695fbf7c6a3e54313262639b198291533"><code>d5ba4a1</code></a>
httputil: Fix quadratic performance of cookie parsing</li>
<li>See full diff in <a
href="https://github.com/tornadoweb/tornado/compare/v6.4.1...v6.4.2">compare
view</a></li>
</ul>
</details>
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