chore(deps): bump async-mutex from 0.4.0 to 0.4.1 (#777)

Bumps [async-mutex](https://github.com/DirtyHairy/async-mutex) from 0.4.0 to 0.4.1.
- [Changelog](https://github.com/DirtyHairy/async-mutex/blob/master/CHANGELOG.md)
- [Commits](https://github.com/DirtyHairy/async-mutex/compare/v0.4.0...v0.4.1)

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

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