Fix Hetzner CCM cluster-cidr (#9127)

roles/kubernetes-apps/external_cloud_controller/hcloud/templates/external-hcloud-cloud-controller-manager-ds-with-networks.yml.j2

@@ -43,7 +43,7 @@ spec:
             - "--leader-elect=false"
             - "--allow-untagged-cloud"
             - "--allocate-node-cidrs=true"
-            - "--cluster-cidr=10.244.0.0/16"
+            - "--cluster-cidr={{ kube_pods_subnet }}"
 {% if external_hcloud_cloud.controller_extra_args is defined %}
 
           args: