Update parking_lot requirement from 0.11 to 0.12

Updates the requirements on [parking_lot](https://github.com/Amanieu/parking_lot) to permit the latest version.
- [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...0.12.0)

---
updated-dependencies:
- dependency-name: parking_lot
  dependency-type: direct:production
...

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

kube-runtime/Cargo.toml

@@ -26,7 +26,7 @@ derivative = "2.1.1"
 serde = "1.0.130"
 smallvec = "1.7.0"
 ahash = "0.7"
-parking_lot = "0.11"
+parking_lot = "0.12"
 pin-project = "1.0.2"
 tokio = { version = "1.14.0", features = ["time"] }
 tokio-util = { version = "0.6.8", features = ["time"] }