Bump proc-macro2 from 1.0.47 to 1.0.49 (#2488)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.47 to 1.0.49.
<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>1.0.48</h2>
<ul>
<li>Documentation improvements</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="293705d8df"><code>293705d</code></a> Release 1.0.49</li>
<li><a href="6b9ee3dbf6"><code>6b9ee3d</code></a> Opt out -Zrustdoc-scrape-examples on docs.rs</li>
<li><a href="a83ad604b1"><code>a83ad60</code></a> Release 1.0.48</li>
<li><a href="b4fa77fea7"><code>b4fa77f</code></a> Update build status badge</li>
<li><a href="975c3248db"><code>975c324</code></a> Time out workflows after 45 minutes</li>
<li><a href="f633e3106c"><code>f633e31</code></a> MIT copyright line</li>
<li>See full diff in <a href="https://github.com/dtolnay/proc-macro2/compare/1.0.47...1.0.49">compare view</a></li>
</ul>
</details>
<br />


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</details>

Cargo.lock

@@ -1405,9 +1405,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.47"
+version = "1.0.49"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
+checksum = "57a8eca9f9c4ffde41714334dee777596264c7825420f521abc92b5b5deb63a5"
 dependencies = [
  "unicode-ident",
 ]