Bump parking_lot from 0.12.1 to 0.12.2

Bumps [parking_lot](https://github.com/Amanieu/parking_lot) from 0.12.1 to 0.12.2.
- [Changelog](https://github.com/Amanieu/parking_lot/blob/master/CHANGELOG.md)
- [Commits](Amanieu/parking_lot@0.12.1...0.12.2)

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

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