build(deps): Bump syn from 2.0.91 to 2.0.92 (#648)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.91 to 2.0.92.
<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>2.0.92</h2>
<ul>
<li>Fix parenthesization of jumps inside ranges (<a
href="https://redirect.github.com/dtolnay/syn/issues/1798">#1798</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/syn/commit/c494b9a2cdcf5a5605a3fdcbe1902bd55cc5c9bd"><code>c494b9a</code></a>
Release 2.0.92</li>
<li><a
href="https://github.com/dtolnay/syn/commit/21ec874bd5ddeaf64aeb50df44ede6542eefbafa"><code>21ec874</code></a>
Rename leftmost_subexpression_with_begin_operator</li>
<li><a
href="https://github.com/dtolnay/syn/commit/3a8d163c3a1a6b9d94cb26109d5464a8457cff45"><code>3a8d163</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1801">#1801</a>
from dtolnay/fixupinvariant</li>
<li><a
href="https://github.com/dtolnay/syn/commit/90c730d82db99caa58f81ac9a4ba01474ee331a9"><code>90c730d</code></a>
Add exhaustive test of FixupContext leading/trailing invariant</li>
<li><a
href="https://github.com/dtolnay/syn/commit/4947eb4982539493e8ab2e5ecfc004c7529a4e5e"><code>4947eb4</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1800">#1800</a>
from dtolnay/rightmost</li>
<li><a
href="https://github.com/dtolnay/syn/commit/eb0eb0c97b94dcddc8ca3a5006c7a32371e852a2"><code>eb0eb0c</code></a>
Rename subsequent_subexpression -&gt; rightmost_subexpression</li>
<li><a
href="https://github.com/dtolnay/syn/commit/cf75a9913831a64ee9684870d4881bf0c773e193"><code>cf75a99</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1799">#1799</a>
from dtolnay/precedence</li>
<li><a
href="https://github.com/dtolnay/syn/commit/331b4d0feef75e6bc546624f58fd9b9f3dd644eb"><code>331b4d0</code></a>
Simplify distinction between leading and trailing precedence</li>
<li><a
href="https://github.com/dtolnay/syn/commit/560dd9d643eda31471379bab737108824fbaaded"><code>560dd9d</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1798">#1798</a>
from dtolnay/jumpinrange</li>
<li><a
href="https://github.com/dtolnay/syn/commit/55462c8df86ceca6612409ba44e6cbff728a698e"><code>55462c8</code></a>
Fix parenthesization of jumps in ranges</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/syn/compare/2.0.91...2.0.92">compare
view</a></li>
</ul>
</details>
<br />


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