Bump syn from 2.0.93 to 2.0.94 (#2594)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.93 to 2.0.94.
<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>2.0.94</h2>
<ul>
<li>Expression precedence fixes (<a
href="https://redirect.github.com/dtolnay/syn/issues/1811">#1811</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1812">#1812</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1813">#1813</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1814">#1814</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1815">#1815</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1816">#1816</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1818">#1818</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1819">#1819</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1820">#1820</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1825">#1825</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1826">#1826</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1827">#1827</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1828">#1828</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1829">#1829</a>, <a
href="https://redirect.github.com/dtolnay/syn/issues/1830">#1830</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/syn/commit/417ff92f3fa7d0e718cca21f5e02a2b45570e8ba"><code>417ff92</code></a>
Release 2.0.94</li>
<li><a
href="https://github.com/dtolnay/syn/commit/b2fa2109794eab06677fb8eed6686f74ae47ac82"><code>b2fa210</code></a>
Add test of deeply nested prefix ranges</li>
<li><a
href="https://github.com/dtolnay/syn/commit/bd02f07e3b7d019f023c26619beee4ec5889263a"><code>bd02f07</code></a>
Test larger expr depth</li>
<li><a
href="https://github.com/dtolnay/syn/commit/8b162d4ea875bf0ab23c5e9cf2a4b1565140a656"><code>8b162d4</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1830">#1830</a>
from dtolnay/scan</li>
<li><a
href="https://github.com/dtolnay/syn/commit/215b57df93e09f144cb3ca1c8e8aa26e3ca83df6"><code>215b57d</code></a>
Implement a parser simulator to determine true precedence levels</li>
<li><a
href="https://github.com/dtolnay/syn/commit/6187a08ec2e5abbc3a43499f662e3688a24990e0"><code>6187a08</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1829">#1829</a>
from dtolnay/ifbreakbreak</li>
<li><a
href="https://github.com/dtolnay/syn/commit/4d1f6c01d51f9f7cd464762aef38fb2d5dff65f6"><code>4d1f6c0</code></a>
Fix classification of nested breaks/ranges inside condition</li>
<li><a
href="https://github.com/dtolnay/syn/commit/977a524bccf424ec9ae26391a1d7fb3107be2aca"><code>977a524</code></a>
Add test of second-level break confusable</li>
<li><a
href="https://github.com/dtolnay/syn/commit/9dd90b78144abbf1c29c0ff17cfa5c049914394a"><code>9dd90b7</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1828">#1828</a>
from dtolnay/prevnextoperator</li>
<li><a
href="https://github.com/dtolnay/syn/commit/7e8a56a7e03ceb4cf1a5d2de2d7a0d86b4933e95"><code>7e8a56a</code></a>
Track previous and next operator's precedence in fixup context</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/syn/compare/2.0.93...2.0.94">compare
view</a></li>
</ul>
</details>
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