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/full_install_osm.sh b/installers/full_install_osm.sh
index 830091c..f31d46e 100755
--- a/installers/full_install_osm.sh
+++ b/installers/full_install_osm.sh
@@ -876,7 +876,7 @@
 
 LXD_VERSION=4.0
 JUJU_VERSION=2.9
-JUJU_AGENT_VERSION=2.9.17
+JUJU_AGENT_VERSION=2.9.22
 UNINSTALL=""
 DEVELOP=""
 UPDATE=""