Drop asynctest (#44746)

tests/components/mqtt/test_light.py

@@ -155,6 +155,7 @@ light:
 """
 import json
 from os import path
+from unittest.mock import call, patch
 
 import pytest
 
@@ -188,7 +189,6 @@ from .test_common import (
     help_test_update_with_json_attrs_not_dict,
 )
 
-from tests.async_mock import call, patch
 from tests.common import assert_setup_component, async_fire_mqtt_message
 from tests.components.light import common