www/py-dj42-django-redis: Update to 5.4.0
- Update test suite and switch to USE_PYTHON=pytest
- Pet portclippy while I'm here.
Changelog:
https://github.com/jazzband/django-redis/releases/tag/5.4.0
MFH: 2023Q4
(cherry picked from commit c55ccee4cda5680481c62fa6c95a8869f44adec7)