Merge branch 'renovate/django-cleanup-6.x' into 'master'

Update dependency django-cleanup to v6

See merge request !932

pyproject.toml

@@ -117,7 +117,7 @@ django-oauth-toolkit = "^1.6.2"
 django-redis = "^5.0.0"
 django-storages = {version = "^1.11.1", optional = true}
 boto3 = {version = "^1.17.33", optional = true}
-django-cleanup = "^5.1.0"
+django-cleanup = "^6.0.0"
 djangorestframework = "^3.12.4"
 Whoosh = "^2.7.4"
 django-titofisto = "^0.2.0"