Bump proc-macro2 from 1.0.52 to 1.0.53 (#2722)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.52 to 1.0.53.
<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>1.0.53</h2>
<ul>
<li>Add support for Rust 1.66's <code>source_text()</code> method (<a href="https://redirect.github.com/dtolnay/proc-macro2/issues/350">#350</a>)</li>
</ul>
</blockquote>
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<summary>Commits</summary>
<ul>
<li><a href="https://github.com/dtolnay/proc-macro2/commit/98645fdcf66741e509ee5d5444154038db369973"><code>98645fd</code></a> Release 1.0.53</li>
<li><a href="https://github.com/dtolnay/proc-macro2/commit/b88dc25662fcd0b083fa1540f590c1833c3c9ecc"><code>b88dc25</code></a> Merge pull request <a href="https://redirect.github.com/dtolnay/proc-macro2/issues/350">#350</a> from dtolnay/sourcetext</li>
<li><a href="https://github.com/dtolnay/proc-macro2/commit/efeb5eceb10e7a0a501f7f3f43d7ba06c1d23d2a"><code>efeb5ec</code></a> Call site has no source text</li>
<li><a href="https://github.com/dtolnay/proc-macro2/commit/67c6cbaf162f6244dbf4a87dc829975278590df9"><code>67c6cba</code></a> Expose proc_macro's source_text() on Span</li>
<li>See full diff in <a href="https://github.com/dtolnay/proc-macro2/compare/1.0.52...1.0.53">compare view</a></li>
</ul>
</details>
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