chore(deps): Bump async-trait from 0.1.79 to 0.1.80 (#1306)

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Bumps [async-trait](https://github.com/dtolnay/async-trait) from 0.1.79
to 0.1.80.
<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>0.1.80</h2>
<ul>
<li>Fix unreachable code warning for async functions that return
<code>!</code> (<a
href="https://redirect.github.com/dtolnay/async-trait/issues/265">#265</a>,
thanks <a
href="https://github.com/de-vri-es"><code>@​de-vri-es</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/async-trait/commit/d528b5a816c891c3b5ab90dc4bcc5cc8d384e177"><code>d528b5a</code></a>
Release 0.1.80</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/10b5c9951af4cc787905ca26f95509e059931067"><code>10b5c99</code></a>
Drop support for compilers older than 1.47</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/83a542268d907f503793e64b5764c30b301a06d1"><code>83a5422</code></a>
Drop support for compilers older than 1.45</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/22d017e9415fccf237372a3c5003c5cb44bcef6e"><code>22d017e</code></a>
Build script no longer looks at $DOCS_RS</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/b64d041c6543f5ce48ff356cc5aaf712224b70e4"><code>b64d041</code></a>
Move never_type test under issue266</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/b683da826e34ce1d7d3ac55c6de1d247a21757c8"><code>b683da8</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/async-trait/issues/265">#265</a>
from de-vri-es/fix-unreachable-code-warning</li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/c8d958dfde2c36a5c483c9255729d30361cbd0bf"><code>c8d958d</code></a>
Fix unreachable code warning for functions that return
<code>!</code></li>
<li><a
href="https://github.com/dtolnay/async-trait/commit/4f0b72eb8455834b1b52bdadb411aaf40bdf1b81"><code>4f0b72e</code></a>
Explicitly install a Rust toolchain for cargo-outdated job</li>
<li>See full diff in <a
href="https://github.com/dtolnay/async-trait/compare/0.1.79...0.1.80">compare
view</a></li>
</ul>
</details>
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