Migrate homekit_controller tests to use freezegun (#105646)

tests/components/homekit_controller/conftest.py

@@ -1,9 +1,9 @@
 """HomeKit controller session fixtures."""
 import datetime
-from unittest import mock
 import unittest.mock
 
 from aiohomekit.testing import FakeController
+from freezegun import freeze_time
 import pytest
 
 import homeassistant.util.dt as dt_util
@@ -13,14 +13,13 @@ from tests.components.light.conftest import mock_light_profiles  # noqa: F401
 pytest.register_assert_rewrite("tests.components.homekit_controller.common")
 
 
-@pytest.fixture
-def utcnow(request):
+@pytest.fixture(autouse=True)
+def freeze_time_in_future(request):
     """Freeze time at a known point."""
     now = dt_util.utcnow()
     start_dt = datetime.datetime(now.year + 1, 1, 1, 0, 0, 0, tzinfo=now.tzinfo)
-    with mock.patch("homeassistant.util.dt.utcnow") as dt_utcnow:
-        dt_utcnow.return_value = start_dt
-        yield dt_utcnow
+    with freeze_time(start_dt) as frozen_time:
+        yield frozen_time
 
 
 @pytest.fixture