Bump parking_lot from 0.11.2 to 0.12.1

Bumps [parking_lot](https://github.com/Amanieu/parking_lot) from 0.11.2 to 0.12.1.
- [Release notes](https://github.com/Amanieu/parking_lot/releases)
- [Changelog](https://github.com/Amanieu/parking_lot/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Amanieu/parking_lot/compare/0.11.2...0.12.1)

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

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

bridges/relays/finality/Cargo.toml

@@ -17,4 +17,4 @@ num-traits = "0.2"
 relay-utils = { path = "../utils" }
 
 [dev-dependencies]
-parking_lot = "0.11.0"
+parking_lot = "0.12.1"

bridges/relays/messages/Cargo.toml

@@ -12,7 +12,7 @@ futures = "0.3.5"
 hex = "0.4"
 log = "0.4.17"
 num-traits = "0.2"
-parking_lot = "0.11.0"
+parking_lot = "0.12.1"
 
 # Bridge Dependencies