Bump proc-macro2 from 1.0.53 to 1.0.54 (#2747)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.53 to 1.0.54.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/dtolnay/proc-macro2/releases">proc-macro2's releases</a>.</em></p>
<blockquote>
<h2>1.0.54</h2>
<ul>
<li>Performance improvement to &quot;span-locations&quot; feature (<a href="https://redirect.github.com/dtolnay/proc-macro2/issues/373">#373</a>)</li>
<li>Fix unbounded memory usage when calling proc-macro2's parser from a fuzzer (<a href="https://redirect.github.com/dtolnay/proc-macro2/issues/374">#374</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="9f9328b7f0"><code>9f9328b</code></a> Release 1.0.54</li>
<li><a href="35cda6d129"><code>35cda6d</code></a> Merge pull request <a href="https://redirect.github.com/dtolnay/proc-macro2/issues/374">#374</a> from dtolnay/cfgfuzzing</li>
<li><a href="da3949d36b"><code>da3949d</code></a> Disable sourcemap thread_local during fuzzing</li>
<li><a href="eb49335540"><code>eb49335</code></a> Expose a way to fuzz with span-locations enabled</li>
<li><a href="16c2edab1c"><code>16c2eda</code></a> Turn off proc-macro feature for fuzzer</li>
<li><a href="5c05f4bd3a"><code>5c05f4b</code></a> Merge pull request <a href="https://redirect.github.com/dtolnay/proc-macro2/issues/373">#373</a> from dtolnay/filepath</li>
<li><a href="6eda714718"><code>6eda714</code></a> Lazily construct PathBuf for sourcemap entries</li>
<li><a href="990ddbb3f4"><code>990ddbb</code></a> Update fuzz crate gitignore to ignore coverage dir</li>
<li>See full diff in <a href="https://github.com/dtolnay/proc-macro2/compare/1.0.53...1.0.54">compare view</a></li>
</ul>
</details>
<br />


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</details>

Cargo.lock

@@ -3063,9 +3063,9 @@ checksum = "dc375e1527247fe1a97d8b7156678dfe7c1af2fc075c9a4db3690ecd2a148068"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.53"
+version = "1.0.54"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ba466839c78239c09faf015484e5cc04860f88242cff4d03eb038f04b4699b73"
+checksum = "e472a104799c74b514a57226160104aa483546de37e839ec50e3c2e41dd87534"
 dependencies = [
  "unicode-ident",
 ]