Drop asynctest (#44746)

tests/components/mqtt/test_climate.py

@@ -1,6 +1,7 @@
 """The tests for the mqtt climate component."""
 import copy
 import json
+from unittest.mock import call, patch
 
 import pytest
 import voluptuous as vol
@@ -49,7 +50,6 @@ from .test_common import (
     help_test_update_with_json_attrs_not_dict,
 )
 
-from tests.async_mock import call, patch
 from tests.common import async_fire_mqtt_message
 from tests.components.climate import common