cleanup: Remove expired ports:

2023-05-20 www/py-dj40-django-debug-toolbar: Extended support of Django 4.0 ends April 2023, upgrade to the Django 4.1+ version of this port. See https://www.djangoproject.com/download/
2023-05-20 www/py-dj40-django-graphiql-debug-toolbar: Extended support of Django 4.0 ends April 2023, upgrade to the Django 4.1+ version of this port. See https://www.djangoproject.com/download/