updated build runner tasks

lib/api/mhsl/customTimetableEvent/get/getCustomTimetableEventResponse.g.dart

@@ -17,16 +17,8 @@ GetCustomTimetableEventResponse _$GetCustomTimetableEventResponseFromJson(
       );
 
 Map<String, dynamic> _$GetCustomTimetableEventResponseToJson(
-    GetCustomTimetableEventResponse instance) {
-  final val = <String, dynamic>{};
-
-  void writeNotNull(String key, dynamic value) {
-    if (value != null) {
-      val[key] = value;
-    }
-  }
-
-  writeNotNull('headers', instance.headers);
-  val['events'] = instance.events;
-  return val;
-}
+        GetCustomTimetableEventResponse instance) =>
+    <String, dynamic>{
+      if (instance.headers case final value?) 'headers': value,
+      'events': instance.events,
+    };