Bump self_update from 0.40.0 to 0.42.0

Bumps [self_update](https://github.com/jaemk/self_update) from 0.40.0 to 0.42.0.
- [Release notes](https://github.com/jaemk/self_update/releases)
- [Changelog](https://github.com/jaemk/self_update/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jaemk/self_update/commits)

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

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