Add type hint to mock_async_zeroconf in test fixtures (#119057)

tests/components/default_config/conftest.py

@@ -1,8 +1,10 @@
 """default_config session fixtures."""
 
+from unittest.mock import MagicMock
+
 import pytest
 
 
 @pytest.fixture(autouse=True)
-def default_config_mock_async_zeroconf(mock_async_zeroconf):
+def default_config_mock_async_zeroconf(mock_async_zeroconf: MagicMock) -> None:
     """Auto mock zeroconf."""