Drop asynctest (#44746)

tests/components/flux/test_switch.py

@@ -1,4 +1,6 @@
 """The tests for the Flux switch platform."""
+from unittest.mock import patch
+
 import pytest
 
 from homeassistant.components import light, switch
@@ -13,7 +15,6 @@ from homeassistant.core import State
 from homeassistant.setup import async_setup_component
 import homeassistant.util.dt as dt_util
 
-from tests.async_mock import patch
 from tests.common import (
     assert_setup_component,
     async_fire_time_changed,