Make freezegun find event.time_tracker_utcnow (#116284)

tests/patch_time.py

@@ -6,6 +6,7 @@ import datetime
 import time
 
 from homeassistant import runner, util
+from homeassistant.helpers import event as event_helper
 from homeassistant.util import dt as dt_util
 
 
@@ -19,6 +20,9 @@ def _monotonic() -> float:
     return time.monotonic()
 
 
+# Replace partial functions which are not found by freezegun
 dt_util.utcnow = _utcnow  # type: ignore[assignment]
+event_helper.time_tracker_utcnow = _utcnow  # type: ignore[assignment]
 util.utcnow = _utcnow  # type: ignore[assignment]
+
 runner.monotonic = _monotonic  # type: ignore[assignment]