Bump lock_api from 0.4.11 to 0.4.12

Bumps [lock_api](https://github.com/Amanieu/parking_lot) from 0.4.11 to 0.4.12.
- [Changelog](https://github.com/Amanieu/parking_lot/blob/master/CHANGELOG.md)
- [Commits](Amanieu/parking_lot@lock_api-0.4.11...lock_api-0.4.12)

---
updated-dependencies:
- dependency-name: lock_api
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>