Redis: use `django-redis` and add password (#10005)
* Redis: use `django-redis` and add password
Use `django-redis` instead of `django-redis-cache` and connect to Redis via
password. `django-redis` allows also to connect to Redis via SSL.
Celery instances also connect to Redis using the user/password authentication
method.
* Requirements: update to get `redis` versions
* Requirements: redis didn't upgrade properly
* Requirements: upgrade properly
