Merge pull request #572 from wger-project/dependabot/pub/json_serializable-6.8.0

Bump json_serializable from 6.7.1 to 6.8.0

Author: Dieterbe

pubspec.yaml

@@ -76,7 +76,7 @@ dev_dependencies:
   integration_test:
     sdk: flutter
   build_runner: ^2.4.9
-  json_serializable: ^6.7.1
+  json_serializable: ^6.8.0
   mockito: ^5.4.4
   network_image_mock: ^2.1.1
   flutter_lints: ^4.0.0