chore(deps): bump parking_lot from 0.12.3 to 0.12.4

Bumps [parking_lot](https://github.com/Amanieu/parking_lot) from 0.12.3 to 0.12.4.
- [Release notes](https://github.com/Amanieu/parking_lot/releases)
- [Changelog](https://github.com/Amanieu/parking_lot/blob/master/CHANGELOG.md)
- [Commits](Amanieu/parking_lot@0.12.3...parking_lot-v0.12.4)

---
updated-dependencies:
- dependency-name: parking_lot
  dependency-version: 0.12.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]