Take the latest available GKE version instead of specific one (#6909)
Take the latest available GKE version instead of specific one (#6909)


smawson/istio,istio/istio,istio/istio,istio/istio,geeknoid/istio,istio/istio,smawson/istio,istio/istio,smawson/istio,geeknoid/istio,smawson/istio,geeknoid/istio,geeknoid/istio,geeknoid/istio,geeknoid/istio,smawson/istio,smawson/istio