Django Cache Module: handle cache clusters

[antonpirker]

Problem Statement

When using a cluster for caching the LOCATION property in the Django CACHES settings is a list of servers. Make sure we handle this case in _get_address_port here: https://github.com/getsentry/sentry-python/blob/antonpirker/django-caching-module/sentry_sdk/integrations/django/caching.py#L128

Solution Brainstorm

We need to define what exactly should be sent so Sentry in that case.