Remove providing_args= from Signals.
Remove providing_args= from Signals.

Historically, Django `Signal` objects took a `providing_args` argument,
which never really did anything of consequence. Django 3.1 deprecated
this, and it's being removed in Django 4.

This change simply removes these from the signals. We will be relying on
the provided documentation for each argument instead.

Testing Done:
Unit tests passed on all supported versions of Django.

Successfully created and evolved databases.

Reviewed at https://reviews.reviewboard.org/r/11876/

beanbaginc/django-evolution