Bump syn from 2.0.95 to 2.0.96 (#1547)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.95 to 2.0.96.
<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>2.0.96</h2>
<ul>
<li>Expression precedence fixes (<a
href="https://redirect.github.com/dtolnay/syn/issues/1834">#1834</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1836">#1836</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1837">#1837</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1838">#1838</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1839">#1839</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1840">#1840</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/syn/commit/d1cbce8ef483a182c8d584ea88c248ffe89b6c96"><code>d1cbce8</code></a>
Release 2.0.96</li>
<li><a
href="https://github.com/dtolnay/syn/commit/80d8d12bb94631453eecb635271c1b64517e1a74"><code>80d8d12</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1840">#1840</a>
from dtolnay/letchain</li>
<li><a
href="https://github.com/dtolnay/syn/commit/96175bea89134a416dfd7f8db93a4c157187020a"><code>96175be</code></a>
Integrate Expr::Let into precedence fixups</li>
<li><a
href="https://github.com/dtolnay/syn/commit/1f096d3fb43e6e96fa0761b30f312b6e9513bfa0"><code>1f096d3</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1839">#1839</a>
from dtolnay/chainedcompare</li>
<li><a
href="https://github.com/dtolnay/syn/commit/49443622bd2ff2986554ca58d7ee13436d784c22"><code>4944362</code></a>
Fix parenthesization of chained comparisons containing bailout</li>
<li><a
href="https://github.com/dtolnay/syn/commit/fd198d9b0c9cd850666618156758f78df45d73e0"><code>fd198d9</code></a>
Generalize Expr::Range bailout to any operator that can begin expr</li>
<li><a
href="https://github.com/dtolnay/syn/commit/d3f2879241b90a12182d1d78a04fc91088c584e0"><code>d3f2879</code></a>
Add regression test for chained comparisons with bailout</li>
<li><a
href="https://github.com/dtolnay/syn/commit/9872bef59a86cfec11d7283fb0866ae261225097"><code>9872bef</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1838">#1838</a>
from dtolnay/prevoperator</li>
<li><a
href="https://github.com/dtolnay/syn/commit/00a125eeeeb9f714bc55dcbe058985bedb636154"><code>00a125e</code></a>
Short-circuit precedence scan for high-precedence expressions</li>
<li><a
href="https://github.com/dtolnay/syn/commit/83195c05e8c7869a28f324b8889fc9aeead9750b"><code>83195c0</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1837">#1837</a>
from dtolnay/rangebailout</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/syn/compare/2.0.95...2.0.96">compare
view</a></li>
</ul>
</details>
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