Bump firebase_core and firebase_crashlytics in /game_template (#2322)

game_template/pubspec.yaml

@@ -23,8 +23,8 @@ dependencies:
   # If you don't need one of the following dependencies,
   # delete the relevant line below, and get rid of any Dart code
   # that references the dependency.
-  firebase_core: ^2.1.1  # Needed for Crashlytics below
-  firebase_crashlytics: ^3.4.16  # Error reporting
+  firebase_core: ^3.0.0  # Needed for Crashlytics below
+  firebase_crashlytics: ^4.0.0  # Error reporting
   games_services: ^4.0.0  # Achievements and leaderboards
   google_mobile_ads: ^5.0.0  # Ads
   in_app_purchase: ^3.0.1  # In-app purchases