Bump async-channel from 2.2.0 to 2.2.1 (#492)

Bumps [async-channel](https://github.com/smol-rs/async-channel) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/smol-rs/async-channel/releases)
- [Changelog](https://github.com/smol-rs/async-channel/blob/master/CHANGELOG.md)
- [Commits](smol-rs/async-channel@v2.2.0...v2.2.1)

---
updated-dependencies:
- dependency-name: async-channel
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]