Python requirements and Docker version upgrades (#826)

v3.0.0: Python, Django, Celery and other version upgrades

cms/settings.py

@@ -485,3 +485,5 @@ if GLOBAL_LOGIN_REQUIRED:
         r'/accounts/confirm-email/.*/$',
         r'/api/v[0-9]+/',
     ]
+
+DEFAULT_AUTO_FIELD = 'django.db.models.AutoField'

cms/urls.py

@@ -1,7 +1,7 @@
 import debug_toolbar
-from django.conf.urls import include, re_path
+from django.conf.urls import include
 from django.contrib import admin
-from django.urls import path
+from django.urls import path, re_path
 from django.views.generic.base import TemplateView
 from drf_yasg import openapi
 from drf_yasg.views import get_schema_view