Use built-in test helpers on 3.8 (#34901)

tests/components/image_processing/test_init.py

@@ -1,8 +1,6 @@
 """The tests for the image_processing component."""
 from unittest.mock import PropertyMock
 
-from asynctest import patch
-
 import homeassistant.components.http as http
 import homeassistant.components.image_processing as ip
 from homeassistant.const import ATTR_ENTITY_PICTURE
@@ -10,6 +8,7 @@ from homeassistant.core import callback
 from homeassistant.exceptions import HomeAssistantError
 from homeassistant.setup import setup_component
 
+from tests.async_mock import patch
 from tests.common import (
     assert_setup_component,
     get_test_home_assistant,