build(deps): Bump syn from 2.0.85 to 2.0.86 (#609)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.85 to 2.0.86.
<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>2.0.86</h2>
<ul>
<li>Support peeking the end of a parse stream (<a
href="https://redirect.github.com/dtolnay/syn/issues/1689">#1689</a>)</li>
<li>Allow <code>parse_quote!</code> to produce Vec&lt;Attribute&gt; (<a
href="https://redirect.github.com/dtolnay/syn/issues/1775">#1775</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/syn/commit/12b0d1d8fd2ffe4202e457daf560617addbfbf45"><code>12b0d1d</code></a>
Release 2.0.86</li>
<li><a
href="https://github.com/dtolnay/syn/commit/5026851299aa514cb15d27eefa97b03608f936bc"><code>5026851</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1689">#1689</a>
from dtolnay/end</li>
<li><a
href="https://github.com/dtolnay/syn/commit/ab43277a5334460ecca13fed7f03c15dcd24f434"><code>ab43277</code></a>
Support peeking End</li>
<li><a
href="https://github.com/dtolnay/syn/commit/58762c49be361eb82f0f3d25ee58e32951159893"><code>58762c4</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1775">#1775</a>
from dtolnay/pqattr</li>
<li><a
href="https://github.com/dtolnay/syn/commit/7436bb23db8b5e5aea51df8bcdca6ab828b32935"><code>7436bb2</code></a>
Allow <code>parse_quote!</code> to produce Vec&lt;Attribute&gt;</li>
<li>See full diff in <a
href="https://github.com/dtolnay/syn/compare/2.0.85...2.0.86">compare
view</a></li>
</ul>
</details>
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