chore(deps): bump syn from 3.0.5 to 3.0.6 (#1852)

Bumps [syn](https://github.com/dtolnay/syn) from 3.0.5 to 3.0.6.
<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>3.0.6</h2>
<ul>
<li>Fix parsing interpolated lifetime at statement start (<a
href="https://redirect.github.com/dtolnay/syn/issues/2082">#2082</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/syn/commit/559cab55ef0c644f77660840edc3620d0d99d3d7"><code>559cab5</code></a>
Release 3.0.6</li>
<li><a
href="https://github.com/dtolnay/syn/commit/9088cad8189331ba78971cfe406dc645a4288d60"><code>9088cad</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/2082">#2082</a>
from dtolnay/lifetimevar</li>
<li><a
href="https://github.com/dtolnay/syn/commit/3eb43bb446ec3d6ce1ff862c945142c17e76b398"><code>3eb43bb</code></a>
Fix parsing interpolated lifetime at statement start</li>
<li><a
href="https://github.com/dtolnay/syn/commit/7b2f6f9f5d818e90d259cafc55043d9e6044790b"><code>7b2f6f9</code></a>
Add regression test for issue 2081</li>
<li><a
href="https://github.com/dtolnay/syn/commit/d55bcd2546a3a34923c46da569edd65b38b3788d"><code>d55bcd2</code></a>
Update test suite to nightly-2026-09-13</li>
<li><a
href="https://github.com/dtolnay/syn/commit/8e37bca79cf016de10e5eb310e9b679cd3be4726"><code>8e37bca</code></a>
Resolve non_kebab_case_bins warning</li>
<li><a
href="https://github.com/dtolnay/syn/commit/4dfd88f9fd9c2951b20c5c7ab1da5692a68fee34"><code>4dfd88f</code></a>
Update test suite to nightly-2026-09-06</li>
<li>See full diff in <a
href="https://github.com/dtolnay/syn/compare/3.0.5...3.0.6">compare
view</a></li>
</ul>
</details>
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