build(deps): Bump syn from 2.0.75 to 2.0.76 (#582)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.75 to 2.0.76.
<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>2.0.76</h2>
<ul>
<li>Enforce that tail call <code>become</code> keyword is followed by an
expression (<a
href="https://redirect.github.com/dtolnay/syn/issues/1725">#1725</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/syn/commit/ef3e9c6dde79be7590fc90278772663ca31c1a73"><code>ef3e9c6</code></a>
Release 2.0.76</li>
<li><a
href="https://github.com/dtolnay/syn/commit/8f7365ff9685c8ca9527c2de409204179a3efcdf"><code>8f7365f</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1725">#1725</a>
from dtolnay/tailcall</li>
<li><a
href="https://github.com/dtolnay/syn/commit/6cddd9ea714fe034466b4f02d3f7abb484c65ea0"><code>6cddd9e</code></a>
Make tail call expr mandatory</li>
<li>See full diff in <a
href="https://github.com/dtolnay/syn/compare/2.0.75...2.0.76">compare
view</a></li>
</ul>
</details>
<br />


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