Bump syn from 2.0.31 to 2.0.32 (#2142)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.31 to 2.0.32.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/dtolnay/syn/releases">syn's
releases</a>.</em></p>
<blockquote>
<h2>2.0.32</h2>
<ul>
<li>Add <code>Path::require_ident</code> accessor (<a
href="https://redirect.github.com/dtolnay/syn/issues/1496">#1496</a>,
thanks <a
href="https://github.com/Fancyflame"><code>@​Fancyflame</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/syn/commit/41b83c86f7e702c49b93bc184e026de4650c0d8e"><code>41b83c8</code></a>
Release 2.0.32</li>
<li><a
href="https://github.com/dtolnay/syn/commit/e05bcea1f6c03980bdae95828f6fd5fd061de7ef"><code>e05bcea</code></a>
Reword Path::require_ident documentation</li>
<li><a
href="https://github.com/dtolnay/syn/commit/07a89ddd28cdc1b477e8ee842322adfc33a59802"><code>07a89dd</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1496">#1496</a>
from Fancyflame/master</li>
<li><a
href="https://github.com/dtolnay/syn/commit/81945ea8d25e1c3792db741ea4a005b23edcfe41"><code>81945ea</code></a>
Update actions/checkout@v3 -&gt; v4</li>
<li><a
href="https://github.com/dtolnay/syn/commit/97f8eb889ffff8bfa6c0eac4f971da8cf1fda5d7"><code>97f8eb8</code></a>
Added <code>require_ident</code> to <code>Path</code></li>
<li>See full diff in <a
href="https://github.com/dtolnay/syn/compare/2.0.31...2.0.32">compare
view</a></li>
</ul>
</details>
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