Removed providing_args argument for django.dispatch.Signal

Was deprecated in Django 3 and removed in Django 4

dav_events/signals.py

@@ -1,9 +1,9 @@
 from django.dispatch import Signal
 
-event_created = Signal(providing_args=['event'])
-event_updated = Signal(providing_args=['event', 'diff', 'user'])
-event_status_updated = Signal(providing_args=['event', 'flag'])
-event_registration_closed = Signal(providing_args=['event', 'user'])
+event_created = Signal()
+event_updated = Signal()
+event_status_updated = Signal()
+event_registration_closed = Signal()
 
 
 def signal_handler_for_event_update(sender, **kwargs):