chore(deps): bump syn from 2.0.114 to 2.0.116 (#20399)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.114 to 2.0.116.
<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>2.0.116</h2>
<ul>
<li>Optimize parse_fn_arg_or_variadic for less lookahead on erroneous
receiver (<a
href="https://redirect.github.com/dtolnay/syn/issues/1968">#1968</a>)</li>
</ul>
<h2>2.0.115</h2>
<ul>
<li>Enable GenericArgument::Constraint parsing in non-full mode (<a
href="https://redirect.github.com/dtolnay/syn/issues/1966">#1966</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/syn/commit/a62e54a48b3b05add5df0e80fe93906509ad72ae"><code>a62e54a</code></a>
Release 2.0.116</li>
<li><a
href="https://github.com/dtolnay/syn/commit/5a8ed9f32e572f35a952c05f25beb3bd976300a4"><code>5a8ed9f</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1968">#1968</a>
from dtolnay/receiver</li>
<li><a
href="https://github.com/dtolnay/syn/commit/813afcc7733b02a8ad0a829eef431e593a906379"><code>813afcc</code></a>
Optimize parse_fn_arg_or_variadic for less lookahead on erroneous
receiver</li>
<li><a
href="https://github.com/dtolnay/syn/commit/c17215011363b8e936b98a9053726abfbc2bdcc4"><code>c172150</code></a>
Add regression test for issue 1718</li>
<li><a
href="https://github.com/dtolnay/syn/commit/0071ab367ca6c42f94209f8187de3e540231427f"><code>0071ab3</code></a>
Ignore type_complexity clippy lint</li>
<li><a
href="https://github.com/dtolnay/syn/commit/3610c34ebd3f7c6c473d286294cd8e211ec3ebcd"><code>3610c34</code></a>
Release 2.0.115</li>
<li><a
href="https://github.com/dtolnay/syn/commit/f22e80627ff044fddadf0779cf50a3a97bd49aa0"><code>f22e806</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1966">#1966</a>
from dtolnay/constraint</li>
<li><a
href="https://github.com/dtolnay/syn/commit/a3faba715bfd0e0d852b7fbb92146029a5a31b97"><code>a3faba7</code></a>
Enable GenericArgument::Constraint parsing in non-full mode</li>
<li><a
href="https://github.com/dtolnay/syn/commit/90651578ef2188b109c17feed0375a1fd429bd18"><code>9065157</code></a>
Pin CI miri to nightly-2026-02-11</li>
<li><a
href="https://github.com/dtolnay/syn/commit/530e7e76015cd46a61d8b319c15bffea7f1aaf9e"><code>530e7e7</code></a>
Update toml from 0.9 to 1.0</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/syn/compare/2.0.114...2.0.116">compare
view</a></li>
</ul>
</details>
<br />


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