docs: use `dart pub` instead of `pub` in `CONTRIBUTING.md` (#8641)
docs: use `dart pub` instead of `pub` in `CONTRIBUTING.md` (#8641)


firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire