Fix live_receivers for django 5

src/pretix/base/management/commands/runperiodic.py

@@ -64,7 +64,7 @@ class Command(BaseCommand):
         if not periodic_task.receivers or periodic_task.sender_receivers_cache.get(self) is NO_RECEIVERS:
             return
 
-        for receiver in periodic_task._live_receivers(self):
+        for receiver in periodic_task._live_receivers(self)[0]:
             name = f'{receiver.__module__}.{receiver.__name__}'
             if options['list_tasks']:
                 print(name)

src/pretix/presale/views/organizer.py

@@ -576,7 +576,7 @@ def filter_subevents_with_plugins(subevents, sales_channel=None):
     if not app_cache:
         _populate_app_cache()
 
-    for receiver in filter_subevents._live_receivers(None):
+    for receiver in filter_subevents._live_receivers(None)[0]:
         app = get_defining_app(receiver)
         event_state = {}