Update helm and kubernetes version in installer to 3.15.1 and 1.30.1 respectively

Change-Id: Ia5fba60b94a9fe6758debd956b35ba2df78f7d9b
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/install_kubeadm_cluster.sh b/installers/install_kubeadm_cluster.sh
index f0171d0..c64e28f 100755
--- a/installers/install_kubeadm_cluster.sh
+++ b/installers/install_kubeadm_cluster.sh
@@ -15,8 +15,8 @@
 
 set +eux
 
-K8S_VERSION=1.29
-K8S_PACKAGE_VERSION="$K8S_VERSION".3-1.1
+K8S_VERSION=1.30
+K8S_PACKAGE_VERSION="$K8S_VERSION".1-1.1
 
 # installs kubernetes packages
 function install_kube() {