refactor(data_fetch_middleware): remove unused import

- Remove unused import of model_registry.dart

Author: fulleni

lib/src/middlewares/data_fetch_middleware.dart

@@ -2,7 +2,6 @@ import 'package:core/core.dart';
 import 'package:dart_frog/dart_frog.dart';
 import 'package:data_repository/data_repository.dart';
 import 'package:flutter_news_app_api_server_full_source_code/src/middlewares/ownership_check_middleware.dart';
-import 'package:flutter_news_app_api_server_full_source_code/src/registry/model_registry.dart';
 import 'package:flutter_news_app_api_server_full_source_code/src/services/dashboard_summary_service.dart';
 import 'package:logging/logging.dart';