Cloud DNS update to GKE Autopilot causing cluster replacement

Google have change Autopilot cluster to use Cloud DNS which replaces kube-dns. This will cause existing Autopilot clusters to be replaced due to the following:

        dns_config { # forces replacement
          - cluster_dns        = "CLOUD_DNS" -> null
          - cluster_dns_domain = "cluster.local" -> null
          - cluster_dns_scope  = "CLUSTER_SCOPE" -> null
        }

The dns_config needs adding to the module for Autopilot clusters to prevent this occurring.