Add arbitrary named arguments to @receiver decorator (typeddjango#2342)

@receiver accepts arbitrary keyword arguments - per [the docs](https://docs.djangoproject.com/en/5.1/topics/signals/#django.dispatch.receiver)

This comes in handy for some third party apps

django-stubs/dispatch/dispatcher.pyi

@@ -34,4 +34,5 @@ def receiver(
     sender: object | None = ...,
     weak: bool = ...,
     dispatch_uid: Hashable | None = ...,
+    **named: Any,
 ) -> Callable[[_F], _F]: ...