Release django 5.1 support, consider less defensive dependency requirement

[Andrioden]

Cant use django 5.1 atm, pipenv dont allow resolving the dependency hierarchy

using

django = "==5.1"
django-cachalot = "==2.6.2"

running

pipenv update -verbose

gives

The conflict is caused by:
    The user requested django==5.1
    django-cachalot 2.6.2 depends on Django<5.1 and >=3.2
...
RuntimeError: Failed to lock Pipfile.lock!