Bump async-executor from 1.5.3 to 1.5.4

Bumps [async-executor](https://github.com/smol-rs/async-executor) from 1.5.3 to 1.5.4.
- [Release notes](https://github.com/smol-rs/async-executor/releases)
- [Changelog](https://github.com/smol-rs/async-executor/blob/master/CHANGELOG.md)
- [Commits](smol-rs/async-executor@v1.5.3...v1.5.4)

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

Signed-off-by: dependabot[bot] <[email protected]>