Auto merge of #26780 - servo:dependabot/cargo/proc-macro2-0.4.30, r=jdm

build(deps): bump proc-macro2 from 0.4.26 to 0.4.30

Bumps [proc-macro2](https://github.com/alexcrichton/proc-macro2) from 0.4.26 to 0.4.30.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/alexcrichton/proc-macro2/releases">proc-macro2's releases</a>.</em></p>
<blockquote>
<h2>0.4.30</h2>
<ul>
<li>Implement Clone for TokenStream's IntoIter (<a href="https://github-redirect.dependabot.com/alexcrichton/proc-macro2/issues/177">#177</a>, thanks <a href="https://github.com/ivanbakel">@ivanbakel</a>)</li>
</ul>
<h2>0.4.29</h2>
<ul>
<li>Support compiling with <code>RUSTFLAGS='-Z allow-features='</code> on a nightly compiler (<a href="https://github-redirect.dependabot.com/alexcrichton/proc-macro2/issues/176">#176</a>, thanks <a href="https://github.com/Nemo157">@Nemo157</a>)</li>
</ul>
<h2>0.4.28</h2>
<ul>
<li>Avoid needlessly escaping <code>'</code> inside a string literal or <code>&quot;</code> inside a character literal (<a href="https://github-redirect.dependabot.com/alexcrichton/proc-macro2/issues/60">#60</a>)</li>
<li>Add impls of Copy, Clone, Debug, PartialEq, Eq for proc_macro2::LineColumn</li>
</ul>
<h2>0.4.27</h2>
<ul>
<li>
<p>Add Cargo cfg <code>&quot;span-locations&quot;</code> to expose <a href="https://docs.rs/proc-macro2/0.4/proc_macro2/struct.Span.html#method.start"><code>Span::start</code></a> and <a href="https://docs.rs/proc-macro2/0.4/proc_macro2/struct.Span.html#method.end"><code>Span::end</code></a> accessors that give the line and column location of a Span (<a href="https://github-redirect.dependabot.com/alexcrichton/proc-macro2/issues/166">#166</a>)</p>
<p>Be aware that this involves storing more information than before inside of Spans which increases their size -- leading to possibly slower performance of any code involving proc-macro2 types (but only when the cfg is enabled).</p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="f514921bb4"><code>f514921</code></a> Release 0.4.30</li>
<li><a href="1ef4d12484"><code>1ef4d12</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/alexcrichton/proc-macro2/issues/177">#177</a> from ivanbakel/cloneable_intoiter</li>
<li><a href="f6754d35b2"><code>f6754d3</code></a> Make TokenStream's IntoIter derive Clone</li>
<li><a href="79c8ed793f"><code>79c8ed7</code></a> Release 0.4.29</li>
<li><a href="ce12a482f0"><code>ce12a48</code></a> Remove double negative in !proc_macro_span_disallowed</li>
<li><a href="b455dd7764"><code>b455dd7</code></a> Use a cfg called proc_macro_span to control feature(proc_macro_span)</li>
<li><a href="8a1827af91"><code>8a1827a</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/alexcrichton/proc-macro2/issues/176">#176</a> from Nemo157/block-nightly-feature</li>
<li><a href="099db2afbb"><code>099db2a</code></a> Detect if the user has disallowed usage of the proc_macro_span feature</li>
<li><a href="692f49ce86"><code>692f49c</code></a> Fix reference to Serde in contribution section</li>
<li><a href="16c2b45e92"><code>16c2b45</code></a> Release 0.4.28</li>
<li>Additional commits viewable in <a href="https://github.com/alexcrichton/proc-macro2/compare/0.4.26...0.4.30">compare view</a></li>
</ul>
</details>
<br />

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Cargo.lock

@@ -4186,9 +4186,9 @@ checksum = "369a6ed065f249a159e06c45752c780bda2fb53c995718f9e484d08daa9eb42e"
 
 [[package]]
 name = "proc-macro2"
-version = "0.4.26"
+version = "0.4.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38fddd23d98b2144d197c0eca5705632d4fe2667d14a6be5df8934f8d74f1978"
+checksum = "cf3d2011ab5c909338f7887f4fc896d35932e29146c12c8d01da6b22a80ba759"
 dependencies = [
  "unicode-xid 0.1.0",
 ]
@@ -4263,7 +4263,7 @@ version = "0.6.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ce23b6b870e8f94f81fb0a363d65d86675884b34a09043c81e5562f11c1f8e1"
 dependencies = [
- "proc-macro2 0.4.26",
+ "proc-macro2 0.4.30",
 ]
 
 [[package]]
@@ -6379,7 +6379,7 @@ version = "0.21.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bf3828c568714507315ee425a9529edc4a4aa9901409e373e9e0027e7622b79e"
 dependencies = [
- "proc-macro2 0.4.26",
+ "proc-macro2 0.4.30",
  "quote 0.6.13",
  "xml-rs",
 ]