deprecate

GCP: fix kubectl auth plugin deprecation warning by installing new auth plugin

Starting with Kubernetes client 1.22, you may start seeing warning messages about your authentication mechanism when running commands.  Here is an example when using gcloud for GKE cluster credentials. WARNING: the gcp auth plugin is deprecated in v1.22+, unavailable in v1.26+; use gcloud instead. This is because the authentication provider-specific login code will be removed GCP: fix kubectl auth plugin deprecation warning by installing new auth plugin