chore(deps): bump proc-macro2 from 1.0.93 to 1.0.94 (#5217)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.93
to 1.0.94.
<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>1.0.94</h2>
<ul>
<li>Documentation improvements</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/7cb0f3cdee5888a581c0041ba9acae5727372277"><code>7cb0f3c</code></a>
Release 1.0.94</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/23c425c9ef1dd7c04f8c303f57506b16688a5ce6"><code>23c425c</code></a>
Raise minimum tested compiler to rust 1.67</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/cbffe0cf98cd99bcbc498941a45a011c7ef7cc2e"><code>cbffe0c</code></a>
Ignore elidable_lifetime_names pedantic clippy lint</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/a12fe8b2b4b506ffd5a7f0dfe36973aeb0e202c2"><code>a12fe8b</code></a>
Point standard library links to stable</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/36920b198e21d694a62b4090448c85eb84633226"><code>36920b1</code></a>
Combine rustdoc semver exempt cfg into one argument</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/3a9bc71cb0dfab98bf8974c8ed1be5a4d6950830"><code>3a9bc71</code></a>
Convert html links to intra-doc links</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/c7d999c89febc2d3e73e1c934c8307734d9825a1"><code>c7d999c</code></a>
Unset doc-scrape-examples for lib target</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/020a8aef00ebd3a210f0493803fe1e04d04057cc"><code>020a8ae</code></a>
Resolve unnecessary_semicolon pedantic clippy lint</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/0a77455b508826965e392019dd6a1b7f432b8aea"><code>0a77455</code></a>
Ignore WebAssembly linker warning</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/ffc417ac5bc177e226c24d4237c9a3a49535f937"><code>ffc417a</code></a>
More precise gitignore patterns</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/proc-macro2/compare/1.0.93...1.0.94">compare
view</a></li>
</ul>
</details>
<br />


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