Drop asynctest (#44746)

tests/components/template/test_trigger.py

@@ -1,6 +1,7 @@
 """The tests for the Template automation."""
 from datetime import timedelta
 from unittest import mock
+from unittest.mock import patch
 
 import pytest
 
@@ -11,7 +12,6 @@ from homeassistant.core import Context, callback
 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,