Bump parking_lot from 0.11.0 to 0.11.1

Bumps [parking_lot](https://github.com/Amanieu/parking_lot) from 0.11.0 to 0.11.1.
- [Release notes](https://github.com/Amanieu/parking_lot/releases)
- [Changelog](https://github.com/Amanieu/parking_lot/blob/master/CHANGELOG.md)
- [Commits](Amanieu/parking_lot@0.11.0...0.11.1)

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