Bug 1841: LTS Support K8s upgrade

This fix changes the K8s version to 1.23 in installation scripts.

Change-Id: Id020ece215f62ac9633a5190392350dbb8da515a
Signed-off-by: aticig <gulsum.atici@canonical.com>
diff --git a/installers/docker/cluster-config.yaml b/installers/docker/cluster-config.yaml
index 1d83bb6..3abec44 100644
--- a/installers/docker/cluster-config.yaml
+++ b/installers/docker/cluster-config.yaml
@@ -14,7 +14,7 @@
 # limitations under the License
 # Author: Vijay Nag B S (vijaynag.bs@tataelxsi.co.in)
 
-apiVersion: kubeadm.k8s.io/v1beta1
+apiVersion: kubeadm.k8s.io/v1beta3
 kind: ClusterConfiguration
 networking:
   podSubnet: 10.244.0.0/16