build(deps): Bump syn from 2.0.76 to 2.0.77 (#584)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.76 to 2.0.77.
<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>2.0.77</h2>
<ul>
<li>Support parsing <code>Expr::Tuple</code> in non-&quot;full&quot;
mode (<a
href="https://redirect.github.com/dtolnay/syn/issues/1727">#1727</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/syn/commit/6232266b0b522ca144eb2910a51670eb9685bca5"><code>6232266</code></a>
Release 2.0.77</li>
<li><a
href="https://github.com/dtolnay/syn/commit/97acbf0ffae4fa17f971cc15cd0586ea94bc7423"><code>97acbf0</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1727">#1727</a>
from dtolnay/exprparen</li>
<li><a
href="https://github.com/dtolnay/syn/commit/a3b5a5c10942c2dfc42f7c7dbd80d2d6672dbcb9"><code>a3b5a5c</code></a>
Support parsing Expr::Tuple in derive</li>
<li><a
href="https://github.com/dtolnay/syn/commit/3c24f576d7e1655da51bac4a6f80ded898fb9840"><code>3c24f57</code></a>
Run upload-artifact action regardless of previous step failure</li>
<li><a
href="https://github.com/dtolnay/syn/commit/78608a3ebe0bab46d0791e91f35b9966a92962df"><code>78608a3</code></a>
Upload CI Cargo.lock for reproducing failures</li>
<li>See full diff in <a
href="https://github.com/dtolnay/syn/compare/2.0.76...2.0.77">compare
view</a></li>
</ul>
</details>
<br />


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