Fix for django 3.2
Django 3.2 brings a check for SITE_ID that breaks the django-multisite completely. More info here: shestera#9
So, we need the latest django-multisite and at the same time need the fix for django 3.2. Trying fix from the upstream fork, in the hope that there is a new fix for the project released and we are not stuck with an incompatible patch.