Update type of EventContext.rejected (#13460)

synapse/storage/databases/main/events.py

@@ -1490,7 +1490,7 @@ class PersistEventsStore:
                     event.sender,
                     "url" in event.content and isinstance(event.content["url"], str),
                     event.get_state_key(),
-                    context.rejected or None,
+                    context.rejected,
                 )
                 for event, context in events_and_contexts
             ),