chore(deps): Bump proc-macro2 from 1.0.64 to 1.0.66 (vectordotdev#17989)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.64
to 1.0.66.
<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>1.0.65</h2>
<ul>
<li>Documentation improvements</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/64b4608278be46fcc8d63ae1138da8cb600e258a"><code>64b4608</code></a>
Release 1.0.66</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/11d8cabc70009c644482182b1dfa1584609b590e"><code>11d8cab</code></a>
Update supported compiler in description of semver exempt polyfill</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/fc8af0d27760113ff45c4f1d3c752f7954e95cbe"><code>fc8af0d</code></a>
Revert &quot;Fix test failure due to quoting change in str's
Debug&quot;</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/177c70071151a0be9117f1439d2f487e6722df3c"><code>177c700</code></a>
Import from alloc to make remaining std dependencies clear</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/00360bc9fd589ec04c9ad753faefb381cce8baa1"><code>00360bc</code></a>
Delete no_group_open_close config for rustc older than 1.55</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/346cc0533f0049cd84267f002ac6fc9356c5a170"><code>346cc05</code></a>
Inline compiler_literal_from_str</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/2d8dd97adcc3a5495bac96caad29247872499073"><code>2d8dd97</code></a>
Delete no_literal_from_str config for rustc older than 1.54</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/3f96a77cb5c63ca3106784b0c4287c8f11b21b78"><code>3f96a77</code></a>
Delete no_ident_new_raw config for rustc older than 1.47</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/56c04ea4a23673947191de8904bb4c391dd7b985"><code>56c04ea</code></a>
Delete no_hygiene config for rustc older than 1.45</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/467a0b40da2b039d4434ebcadbb27186f2a13761"><code>467a0b4</code></a>
Delete no_lexerror_display config for rustc older than 1.44</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/proc-macro2/compare/1.0.64...1.0.66">compare
view</a></li>
</ul>
</details>
<br />


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