update PE_VERSION=v4.6.18, luet_version to v4.6.18

Author: santhoshdaivajna

Earthfile

@@ -20,8 +20,8 @@ ARG KAIROS_BASE_IMAGE_URL=$SPECTRO_PUB_REPO/edge
 ARG LUET_PROJECT=luet-repo
 
 # Spectro Cloud and Kairos tags.
-ARG PE_VERSION=v4.6.17
-ARG SPECTRO_LUET_VERSION=v4.6.16
+ARG PE_VERSION=v4.6.18
+ARG SPECTRO_LUET_VERSION=v4.6.18
 ARG KAIROS_VERSION=v3.1.3
 ARG K3S_FLAVOR_TAG=k3s1
 ARG RKE2_FLAVOR_TAG=rke2r1