Bump proc-macro2 from 1.0.78 to 1.0.79 (#2341)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.78
to 1.0.79.
<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>1.0.79</h2>
<ul>
<li>Clean up dead code</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/4ba4ab1ec52d9e8286826a898430683ba002a002"><code>4ba4ab1</code></a>
Release 1.0.79</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/b1765814b6db85dd5dd725734df76a4bd9426a23"><code>b176581</code></a>
Prevent new lint from turning off nightly span support under
-Dwarnings</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/b9cd8646cbc5d2170240dd214d4ab932d70e3b2c"><code>b9cd864</code></a>
Fix dead_code warning on fallback SourceFile</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/e94f4326bdd5a94e16be6da362af2e31bea52583"><code>e94f432</code></a>
Ignore incompatible_msrv clippy lint for conditionally compiled
code</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/18c75c63d38639c2edfc98da95bdf27e417d90d7"><code>18c75c6</code></a>
Ignore dead_code warning in test</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/5cd21eb2af2f815471023bae051d445d2d923aaa"><code>5cd21eb</code></a>
Update ui test suite to nightly-2024-02-01</li>
<li>See full diff in <a
href="https://github.com/dtolnay/proc-macro2/compare/1.0.78...1.0.79">compare
view</a></li>
</ul>
</details>
<br />


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