🩹(backend) add missing Django settings for cold storage access

After configuring the cold storage infrastructure, I forgot to add Django
settings needed to access the configuration.

src/helm/extra/templates/s3.yaml

@@ -5,4 +5,4 @@ metadata:
   namespace: {{ .Release.Namespace | quote }}
 spec:
   provider: data
-  versioned: true
+  versioned: true