Fix DeprecationWarning with Django 4.1
Fix DeprecationWarning with Django 4.1

Fixes the following warning:
```
RemovedInDjango41Warning: 'waffle' defines default_app_config = 'waffle.apps.WaffleConfig'
```

rsalmaso/django-waffle,rodgomes/django-waffle,rsalmaso/django-waffle,rsalmaso/django-waffle,rodgomes/django-waffle,rodgomes/django-waffle,rsalmaso/django-waffle,rodgomes/django-waffle