Auto merge of #27825 - servo:dependabot/cargo/rustc-demangle-0.1.18, r=jdm

Bump rustc-demangle from 0.1.16 to 0.1.18

Bumps [rustc-demangle](https://github.com/alexcrichton/rustc-demangle) from 0.1.16 to 0.1.18.
<details>
<summary>Commits</summary>
<ul>
<li><a href="8c700799ee"><code>8c70079</code></a> Bump to 0.1.18</li>
<li><a href="7d2f5a42e8"><code>7d2f5a4</code></a> Print <code>char</code> using <code>{:?}</code> (<a href="https://github-redirect.dependabot.com/alexcrichton/rustc-demangle/issues/41">#41</a>)</li>
<li><a href="5119b5f76b"><code>5119b5f</code></a> Bump to 0.1.17</li>
<li><a href="7551efa82f"><code>7551efa</code></a> Elide the type when the const value is a placeholder <code>p</code> (<a href="https://github-redirect.dependabot.com/alexcrichton/rustc-demangle/issues/40">#40</a>)</li>
<li><a href="6e407b5377"><code>6e407b5</code></a> Add support for <code>min_const_generics</code> constants (<a href="https://github-redirect.dependabot.com/alexcrichton/rustc-demangle/issues/39">#39</a>)</li>
<li><a href="c4e3ab004e"><code>c4e3ab0</code></a> Add some docs about the C API</li>
<li><a href="1ccd9b4276"><code>1ccd9b4</code></a> C API wrapper (<a href="https://github-redirect.dependabot.com/alexcrichton/rustc-demangle/issues/14">#14</a>)</li>
<li><a href="b2f44f88dc"><code>b2f44f8</code></a> use if let and while let</li>
<li><a href="e9a47da0b0"><code>e9a47da</code></a> apply some style fix from clippy</li>
<li><a href="9a2ef96710"><code>9a2ef96</code></a> replace try! with ?</li>
<li>Additional commits viewable in <a href="https://github.com/alexcrichton/rustc-demangle/compare/0.1.16...0.1.18">compare view</a></li>
</ul>
</details>
<br />

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[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

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Cargo.lock

@@ -4872,9 +4872,9 @@ dependencies = [
 
 [[package]]
 name = "rustc-demangle"
-version = "0.1.16"
+version = "0.1.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
+checksum = "6e3bad0ee36814ca07d7968269dd4b7ec89ec2da10c4bb613928d3077083c232"
 
 [[package]]
 name = "rustc-hash"