Bump async-std from 1.11.0 to 1.12.0 (#610)

Bumps [async-std](https://github.com/async-rs/async-std) from 1.11.0 to 1.12.0.
- [Release notes](https://github.com/async-rs/async-std/releases)
- [Changelog](https://github.com/async-rs/async-std/blob/main/CHANGELOG.md)
- [Commits](https://github.com/async-rs/async-std/compare/v1.11.0...v1.12.0)

---
updated-dependencies:
- dependency-name: async-std
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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