pub get fails due to duplicate mapping key

[mdmohsin7]

🐛 Describe the bug

Flutter pub get fails due to multiple watcher mapping keys in pubspec.lock file.

[Resonate] flutter pub get --no-example
Resolving dependencies...
Failed parsing lock file:

Error on line 1552, column 3 of pubspec.lock: Duplicate mapping key.
     ╷
1552 │   watcher:
     │   ^^^^^^^
     ╵

Consider deleting the file and running `flutter pub get` to recreate it.
exit code 65