build(deps): Bump syn from 2.0.72 to 2.0.74 (#575)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.72 to 2.0.74.
<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>2.0.74</h2>
<ul>
<li>Fix <em>&quot;temporary is dropped and runs the destructor for type
`impl Iterator`&quot;</em> regression affecting certain use of
<code>Generics</code> iterator methods (<a
href="https://redirect.github.com/dtolnay/syn/issues/1719">#1719</a>)</li>
</ul>
<h2>2.0.73</h2>
<ul>
<li>Support parsing unnamed C varargs within function pointer types (<a
href="https://redirect.github.com/dtolnay/syn/issues/1711">#1711</a>)</li>
<li>Improve synthesized error message on unexpected tokens at the end of
the expected contents of a delimited group (<a
href="https://redirect.github.com/dtolnay/syn/issues/1713">#1713</a>)</li>
<li>Support parsing unstable tail call syntax (<a
href="https://redirect.github.com/dtolnay/syn/issues/1714">#1714</a>, <a
href="https://redirect.github.com/rust-lang/rust/issues/112788">rust-lang/rust#112788</a>)</li>
<li>Add <a
href="https://docs.rs/syn/2.0.73/syn/enum.Fields.html#method.members"><code>Fields::members</code></a>
iterator (<a
href="https://redirect.github.com/dtolnay/syn/issues/1716">#1716</a>,
thanks <a
href="https://github.com/Fancyflame"><code>@​Fancyflame</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/syn/commit/b15ae2840910cb6102d4d23d8b1e7bcb91304b23"><code>b15ae28</code></a>
Release 2.0.74</li>
<li><a
href="https://github.com/dtolnay/syn/commit/6cf234444021eb753af7a26f8122c28ce9d84935"><code>6cf2344</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1719">#1719</a>
from dtolnay/iterators</li>
<li><a
href="https://github.com/dtolnay/syn/commit/2955ac55b70952e2114e559d1cd61267225152e8"><code>2955ac5</code></a>
Expose non-impl-Trait iterator return types</li>
<li><a
href="https://github.com/dtolnay/syn/commit/7dc05a564398eabc552a2d46bb580f9a60d410fb"><code>7dc05a5</code></a>
Add regression test for issue 1718</li>
<li><a
href="https://github.com/dtolnay/syn/commit/857942e411d71d3c0787e14e220c8c7d9d491051"><code>857942e</code></a>
Revert &quot;Define Fields::members iterator type privately inside
method&quot;</li>
<li><a
href="https://github.com/dtolnay/syn/commit/65ec30d65913e2368febc1f00a68324ec9a9ecd4"><code>65ec30d</code></a>
Revert &quot;Embed Generics iterator implementations into method
bodies&quot;</li>
<li><a
href="https://github.com/dtolnay/syn/commit/b5a5a8c17737ac7a7b3553ec202626035bfa779c"><code>b5a5a8c</code></a>
Release 2.0.73</li>
<li><a
href="https://github.com/dtolnay/syn/commit/8cdb5c734dab211eef10bbd0c47a251d38dca9e1"><code>8cdb5c7</code></a>
Add example of using Fields::members iterator</li>
<li><a
href="https://github.com/dtolnay/syn/commit/2afdc1267471c9813739a500f9bd2c0b19aa99af"><code>2afdc12</code></a>
Remove redundancy of Generics::split_for_impl cfg with type's cfg</li>
<li><a
href="https://github.com/dtolnay/syn/commit/64b0dc8d0d5fa6b3bf996c60fdff054944f1c993"><code>64b0dc8</code></a>
Combine Generics impl blocks into one</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/syn/compare/2.0.72...2.0.74">compare
view</a></li>
</ul>
</details>
<br />


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