Bumps [syn](https://github.com/dtolnay/syn) from 2.0.8 to 2.0.10.
<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>2.0.10</h2>
<ul>
<li>Fix visibility being parsed incorrectly on macro invocations inside of a trait</li>
</ul>
<h2>2.0.9</h2>
<ul>
<li>Disallow <code>type</code> items in an extern block, trait, or module from being marked <code>default</code></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="c4976f19f0"><code>c4976f1</code></a> Release 2.0.10</li>
<li><a href="1f705d8ec6"><code>1f705d8</code></a> Remove precedence logic for the removed type ascription expression</li>
<li><a href="64ed2b1b19"><code>64ed2b1</code></a> Disallow visibility and defaultness on macro call in trait item position</li>
<li><a href="a33ffa388a"><code>a33ffa3</code></a> Fix parsing of const, async, unsafe, and extern fns inside impl block</li>
<li><a href="94439aae5f"><code>94439aa</code></a> Restore lookahead peek for better error message</li>
<li><a href="275d368069"><code>275d368</code></a> Release 2.0.9</li>
<li><a href="280d5e478d"><code>280d5e4</code></a> Remove dead code from ImplItemFn's ToTokens</li>
<li><a href="5036fd9c6e"><code>5036fd9</code></a> Clean up ImplItemFn hack using ImplItem::Verbatim</li>
<li><a href="0f99d27656"><code>0f99d27</code></a> Factor out some common code for type parsing</li>
<li><a href="fd8d37ee5c"><code>fd8d37e</code></a> Disallow some nonsensical configurations of items</li>
<li>Additional commits viewable in <a href="https://github.com/dtolnay/syn/compare/2.0.8...2.0.10">compare view</a></li>
</ul>
</details>
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