chore(deps): Bump async-trait from 0.1.80 to 0.1.81 (#1406)

Bumps [async-trait](https://github.com/dtolnay/async-trait) from 0.1.80
to 0.1.81.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/dtolnay/async-trait/releases">async-trait's
releases</a>.</em></p>
<blockquote>
<h2>0.1.81</h2>
<ul>
<li>Turn off unneeded features of <code>syn</code> dependency (<a
href="https://redirect.github.com/dtolnay/async-trait/issues/272">#272</a>,
thanks <a
href="https://github.com/klensy"><code>@​klensy</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/async-trait/commit/383f65f138963391a41d25ed7e2857fa002c5742"><code>383f65f</code></a>
Release 0.1.81</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/4ec740e1dddab158a46f59271245984d1b92794d"><code>4ec740e</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/async-trait/issues/273">#273</a>
from dtolnay/cloneimpls</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/b6c606384471c26a06852c0586304965237c0b95"><code>b6c6063</code></a>
Ignore trivially_copy_pass_by_ref pedantic clippy lint</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/315fd9005c8294ecf2d9cce84d1d5a53da656b19"><code>315fd90</code></a>
Turn off syn/clone-impls feature</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/94a3165a30a225c2d78425e4c68fc5ec67929a98"><code>94a3165</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/async-trait/issues/272">#272</a>
from klensy/syn-f</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/2fac9405c8d3ecf8c08b0085ec338b72a643e43c"><code>2fac940</code></a>
syn: remove derive feature</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/4a00d732460d37e219755bfc6db132b42b8c4af1"><code>4a00d73</code></a>
Work around dead code warning in test</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/dba15b5a73f34a2fd96361a2fa8993ba412a43e1"><code>dba15b5</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/async-trait/issues/270">#270</a>
from dtolnay/objsafety</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/d28c95b2037901ff4c36b631054d463f675f991c"><code>d28c95b</code></a>
Former where_clauses_object_safety lint is now hard error</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/78a5922b4a9e81c72676dbeb9ea3bac50535864b"><code>78a5922</code></a>
Fill in ignore reasons in all #[ignore] attributes</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/async-trait/compare/0.1.80...0.1.81">compare
view</a></li>
</ul>
</details>
<br />


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