API refactor

venv/lib/python3.12/site-packages/celery/events/event.py

@@ -55,7 +55,7 @@ def get_exchange(conn, name=EVENT_EXCHANGE_NAME):
         (from topic -> fanout).
     """
     ex = copy(event_exchange)
-    if conn.transport.driver_type == 'redis':
+    if conn.transport.driver_type in {'redis', 'gcpubsub'}:
         # quick hack for Issue #436
         ex.type = 'fanout'
     if name != ex.name: