Fixed Remaining Migration Errors

lib/persistence/time_progress_entity.dart

@@ -29,7 +29,7 @@ class TimeProgressEntity {
     };
   }
 
-  static TimeProgressEntity fromJson(Map<String, Object> json) {
+  static TimeProgressEntity fromJson(dynamic json) {
     final String id = json["id"] as String;
     final String name = json["name"] as String;
     final DateTime startTime =

lib/persistence/time_progress_repository.dart

@@ -16,7 +16,6 @@ class TimeProgressRepository {
     }
     return Future<List<TimeProgressEntity>>.value(codec
         .decode(jsonString)["timers"]
-        .cast<Map<String, Object>>()
         .map<TimeProgressEntity>(TimeProgressEntity.fromJson)
         .toList(growable: false));
   }