alpine-git-gke-aws-auth(deps): bump google/cloud-sdk from 508.0.0 to 509.0.0 in /images/alpine/git/gke-aws-auth

alpine-git-gke-aws-auth(deps): bump google/cloud-sdk from 508.0.0 to 509.0.0 in /images/alpine/git/gke-aws-auth #372