Drop asynctest (#44746)

tests/components/mqtt/test_scene.py

@@ -1,6 +1,7 @@
 """The tests for the MQTT scene platform."""
 import copy
 import json
+from unittest.mock import patch
 
 import pytest
 
@@ -21,8 +22,6 @@ from .test_common import (
     help_test_unique_id,
 )
 
-from tests.async_mock import patch
-
 DEFAULT_CONFIG = {
     scene.DOMAIN: {
         "platform": "mqtt",