fix(deps): update flutters deps depending on source_gen to v4

Author: renovate[bot]

pubspec.yaml

@@ -37,7 +37,7 @@ dependencies:
   logging: 1.3.0
   path_provider: 2.1.5
   path_provider_foundation: any
-  riverpod_annotation: 3.0.0
+  riverpod_annotation: 4.0.1
   sqlite3: any
 
   # UI
@@ -89,7 +89,7 @@ dev_dependencies:
   drift_dev: 2.28.2
   freezed: 3.2.3
   json_serializable: 6.11.1
-  riverpod_generator: 3.0.0
+  riverpod_generator: 4.0.1
 
   # automated testing
   emulators: 0.7.0