Switch Kubernetes image registry from k8s.gcr.io to registry.k8s.io

* Announce: https://groups.google.com/g/kubernetes-sig-testing/c/U7b_im9vRrM

Rel: https://github.com/poseidon/terraform-render-bootstrap/pull/319

aws/fedora-coreos/kubernetes/bootstrap.tf

@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=0d981c24cd417ce2bc0410ad933fe679e94341fd"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=bf8bdd4fb57973bf7296a31e907a2aa1ed4da097"
 
   cluster_name          = var.cluster_name
   api_servers           = [format("%s.%s", var.cluster_name, var.dns_zone)]