TimePickerDialog should dispose created ChangeNotifiers. (#136261)

packages/flutter/lib/src/material/time_picker.dart

@@ -1630,6 +1630,14 @@ class _TimePickerInputState extends State<_TimePickerInput> with RestorationMixi
   final RestorableBool hourHasError = RestorableBool(false);
   final RestorableBool minuteHasError = RestorableBool(false);
 
+  @override
+  void dispose() {
+    _selectedTime.dispose();
+    hourHasError.dispose();
+    minuteHasError.dispose();
+    super.dispose();
+  }
+
   @override
   String? get restorationId => widget.restorationId;
 
@@ -1988,6 +1996,14 @@ class _HourMinuteTextFieldState extends State<_HourMinuteTextField> with Restora
     }
   }
 
+  @override
+  void dispose() {
+    controller.dispose();
+    controllerHasBeenSet.dispose();
+    focusNode.dispose();
+    super.dispose();
+  }
+
   @override
   String? get restorationId => widget.restorationId;