Bump async-trait from 0.1.69 to 0.1.71 in /rust (#1783)

Bumps [async-trait](https://github.com/dtolnay/async-trait) from 0.1.69
to 0.1.71.
<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>0.1.71</h2>
<ul>
<li>Documentation improvements</li>
</ul>
<h2>0.1.70</h2>
<p>No release notes provided.</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="11dfe16292"><code>11dfe16</code></a>
Release 0.1.71</li>
<li><a
href="85172d3b7b"><code>85172d3</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/async-trait/issues/249">#249</a>
from erer1243/update-docs-lifetime</li>
<li><a
href="92acf8138a"><code>92acf81</code></a>
Update doc comments to use lifetime 'async_trait instead of 'async</li>
<li><a
href="f8ce3fb309"><code>f8ce3fb</code></a>
Release 0.1.70</li>
<li><a
href="46631ccd5c"><code>46631cc</code></a>
Eliminate syn 1 from minimal-versions</li>
<li><a
href="eb21940ebf"><code>eb21940</code></a>
Add CI job using minimal-versions</li>
<li>See full diff in <a
href="https://github.com/dtolnay/async-trait/compare/0.1.69...0.1.71">compare
view</a></li>
</ul>
</details>
<br />


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rust/Cargo.lock

@@ -296,9 +296,9 @@ dependencies = [
 
 [[package]]
 name = "async-trait"
-version = "0.1.69"
+version = "0.1.71"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b2d0f03b3640e3a630367e40c468cb7f309529c708ed1d88597047b0e7c6ef7"
+checksum = "a564d521dd56509c4c47480d00b80ee55f7e385ae48db5744c67ad50c92d2ebf"
 dependencies = [
  "proc-macro2",
  "quote",