Update dependency powersync to v2

pubspec.yaml

@@ -38,7 +38,7 @@ dependencies:
   geolocator: ^14.0.0
   permission_handler: ^12.0.0+1
   flutter_dotenv: ^5.2.1
-  powersync: ^1.12.2
+  powersync: ^2.0.0
   uuid: ^4.5.1
   supabase_flutter: ^2.8.4
   google_sign_in: ^6.3.0
@@ -55,7 +55,7 @@ dev_dependencies:
   # activated in the `analysis_options.yaml` file located at the root of your
   # package. See that file for information about deactivating specific lint
   # rules and activating additional ones.
-  flutter_lints: 6.0.0
+  flutter_lints: ^5.0.0
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec