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Bump async-std from 1.7.0 to 1.8.0 (#1577)

Bumps [async-std](https://github.com/async-rs/async-std) from 1.7.0 to 1.8.0.
<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>v1.8.0</h2>
<p>This patch introduces <code>async_std::channel</code>, a new submodule for our async channels implementation. <code>channels</code> have been one of async-std's most requested features, and have existed as &quot;unstable&quot; for the past year. We've been cautious about stabilizing channels, and this caution turned out to be warranted: we realized our channels could hang indefinitely under certain circumstances, and people ended up expressing a need for unbounded channels.</p>
<p>So today we're introducing the new <code>async_std::channel</code> submodule which exports the <code>async-channel</code> crate, and we're marking the older unstable <code>async_std::sync::channel</code> API as &quot;deprecated&quot;. This release includes both APIs, but we intend to stabilize <code>async_std::channel</code> and remove the older API in January. This should give dependent projects a month to upgrade, though we can extend that if it proves to be too short.</p>
<p>The rationale for adding a new top-level <code>channel</code> submodule, rather than extending <code>sync</code> is that the <code>std::sync</code> and <code>async_std::sync</code> submodule are a bit of a mess, and the libs team <a href="%5Bhttps://github-redirect.dependabot.com/rust-lang/rfcs/pull/2788#discussion_r339092478%5D(https://github-redirect.dependabot.com/rust-lang/rfcs/pull/2788#discussion_r339092478)">has been talking about splitting <code>std::sync</code> up</a> into separate modules. The stdlib has to guarantee it'll forever be backwards compatible, but <code>async-std</code> does not (we fully expect a 2.0 once we have async closures &amp; traits). So we're experimenting with this ... (continued)

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