fix: django-axes throws an error when using inmemory cache

Relevant error: django.core.exceptions.ImproperlyConfigured: django-axes does not work properly with LocMemCache as the default cache backend please add e.g. a DummyCache backend for axes and configure it with AXES_CACHE

Solution: https://django-axes.readthedocs.io/en/latest/configuration.html#known-configuration-problems