chore(deps): Bump proc-macro2 from 1.0.63 to 1.0.64 (vectordotdev#17922)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.63
to 1.0.64.
<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>1.0.64</h2>
<ul>
<li>Fix parsing of bare <code>\r</code> in between tokens (<a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/399">#399</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/075af3483426c4ea1ada2521275d6b5796dfa0af"><code>075af34</code></a>
Release 1.0.64</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/ab053d378890540abf2b8365bda837a5ba2b58b6"><code>ab053d3</code></a>
Replace 2 inconsistent ASCII checks with is_ascii()</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/9c812bc5c59952a415eab0071e053c647bcb7973"><code>9c812bc</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/399">#399</a>
from dtolnay/carriagereturn</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/261ad4d6efab9138efb4291704039a8046eae225"><code>261ad4d</code></a>
Extend lone carriage returns test</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/d10651c907fb30283ab4fc602fb366690ec0c7f1"><code>d10651c</code></a>
Revert &quot;Require \r whitespace to be followed by \n&quot;</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/bdfb5c1f1ce766dc1578b1a524f958d1dacc2e32"><code>bdfb5c1</code></a>
Move minimal-versions CI to dedicated job</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/51ed1bbfc03478642e15fca84c4fa50116628847"><code>51ed1bb</code></a>
Resolve needless_rwa_string_hashes clippy lint in test suite</li>
<li>See full diff in <a
href="https://github.com/dtolnay/proc-macro2/compare/1.0.63...1.0.64">compare
view</a></li>
</ul>
</details>
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