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Bump async-std from 1.8.0 to 1.9.0 (#1618)

Bumps [async-std](https://github.com/async-rs/async-std) from 1.8.0 to 1.9.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/async-rs/async-std/releases">async-std's releases</a>.</em></p>
<blockquote>
<h2>v1.9.0</h2>
<p>Happy New Year everyone! This patch stabilizes the <code>async_std::channel</code>
submodule, removes the deprecated <code>sync::channel</code> types, and introduces the
<code>tokio1</code> feature.</p>
<h2>New Channels</h2>
<p>As part of our <code>1.8.0</code> release last month we introduced the new
<code>async_std::channel</code> submodule and deprecated the unstable
<code>async_std::sync::channel</code> types. You can read our full motiviation for this
change in the last patch notes. But the short version is that the old
channels had some fundamental problems, and the <code>sync</code> submodule is a bit of
a mess.</p>
<p>This release of <code>async-std</code> promotes <code>async_std::channel</code> to stable, and
fully removes the <code>async_std::sync::channel</code> types. In practice many
libraries have already been upgraded to the new channels in the past month,
and this will enable much of the ecosystem to switch off &quot;unstable&quot; versions
of <code>async-std</code>.</p>
<pre lang="rust"><code>use async_std::channel;
<p>let (sender, receiver) = channel::unbounded();</p>
<p>assert_eq!(sender.send(&quot;Hello&quot;).await, Ok(()));
assert_eq!(receiver.recv().await, Ok(&quot;Hello&quot;));
</code></pre></p>
<h2>Tokio 1.0 compat</h2>
<p>The Tokio project recently released version 1.0 of their runtime, and the
async-std team would like to congratulate the Tokio team on achieving this
milestone.</p>
<p>This release of <code>async-std</code> adds the <code>tokio1</code> feature flag, enabling Tokio's
TLS constructors to be initialized within the <code>async-std</code> runtime. This is in
addition to the <code>tokio02</code> and <code>toki... (continued)

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