build(deps): bump ipc-channel from 0.20.0 to 0.20.1 (#38253)

Bumps [ipc-channel](https://github.com/servo/ipc-channel) from 0.20.0 to
0.20.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/servo/ipc-channel/releases">ipc-channel's
releases</a>.</em></p>
<blockquote>
<h2>v0.20.1</h2>
<h2>What's Changed</h2>
<ul>
<li>Merge thread_local declarations by <a
href="https://github.com/jschwe"><code>@​jschwe</code></a> in <a
href="https://redirect.github.com/servo/ipc-channel/pull/397">servo/ipc-channel#397</a></li>
<li>Remove receivers from Router IpcReceiverSet on channel close. by <a
href="https://github.com/jdm"><code>@​jdm</code></a> in <a
href="https://redirect.github.com/servo/ipc-channel/pull/400">servo/ipc-channel#400</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/servo/ipc-channel/compare/v0.20.0...v0.20.1">https://github.com/servo/ipc-channel/compare/v0.20.0...v0.20.1</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="69d1d4bf8c"><code>69d1d4b</code></a>
Publish 0.20.1. (<a
href="https://redirect.github.com/servo/ipc-channel/issues/401">#401</a>)</li>
<li><a
href="4c2cbf8cae"><code>4c2cbf8</code></a>
bug: Drop macOS receivers from OsIpcReceiverSet on channel close. (<a
href="https://redirect.github.com/servo/ipc-channel/issues/400">#400</a>)</li>
<li><a
href="59d6d8099c"><code>59d6d80</code></a>
Merge thread_local declarations (<a
href="https://redirect.github.com/servo/ipc-channel/issues/397">#397</a>)</li>
<li>See full diff in <a
href="https://github.com/servo/ipc-channel/compare/v0.20.0...v0.20.1">compare
view</a></li>
</ul>
</details>
<br />


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Cargo.lock

@@ -4475,9 +4475,9 @@ dependencies = [
 
 [[package]]
 name = "ipc-channel"
-version = "0.20.0"
+version = "0.20.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b1c98b70019c830a1fc39cecfe1f60ff99c4122f0a189697c810c90ec545c14"
+checksum = "1700f6b8b9f00cdd675f32fbb3a5be882213140dfe045805273221ca266c43f8"
 dependencies = [
  "bincode",
  "crossbeam-channel",