Merge branch 'renovate/kombu-4.x' into 'develop'

Update dependency kombu to v4.6.11

See merge request verbose-equals-true/django-postgres-vue-gitlab-ecs!112

Author: briancaffey

backend/requirements/base.txt

@@ -1,7 +1,7 @@
 boto3==1.16.4
 
 celery==4.4.7
-kombu==4.6.8
+kombu==4.6.11
 
 channels==2.4.0
 channels-redis==2.4.2