build(deps): Bump syn from 2.0.41 to 2.0.42 (#386)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.41 to 2.0.42.
<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>2.0.42</h2>
<ul>
<li>Documentation improvements</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/syn/commit/6dcf8abe0294c07749f544181927a2bc6c9bbb66"><code>6dcf8ab</code></a>
Release 2.0.42</li>
<li><a
href="https://github.com/dtolnay/syn/commit/4349d0b3245cf5b6b226bac5b20da2e91e201516"><code>4349d0b</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1551">#1551</a>
from dtolnay/cursorexample</li>
<li><a
href="https://github.com/dtolnay/syn/commit/12ff3d19b0b2b398491ea2eaddc3c982dfa761f6"><code>12ff3d1</code></a>
Add a real-world example for ParseBuffer::cursor</li>
<li><a
href="https://github.com/dtolnay/syn/commit/bdd06456bea8b35b7229fdb79b6073ad21b4ba98"><code>bdd0645</code></a>
Precondition for cmp_asssuming_same_buffer is to check same_buffer</li>
<li><a
href="https://github.com/dtolnay/syn/commit/a6ac13888831889a1a81a78ad9b8db2be4ac0aac"><code>a6ac138</code></a>
Update test suite to nightly-2023-12-19</li>
<li><a
href="https://github.com/dtolnay/syn/commit/66ee9029a9a06df59b4bc134ee7ea2ecea36972b"><code>66ee902</code></a>
Ignore blocks_in_conditions clippy lint</li>
<li><a
href="https://github.com/dtolnay/syn/commit/e11575e9703d520a90196f2021b0b2dd987bfffa"><code>e11575e</code></a>
Ignore uninhabited_references clippy lint</li>
<li>See full diff in <a
href="https://github.com/dtolnay/syn/compare/2.0.41...2.0.42">compare
view</a></li>
</ul>
</details>
<br />


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