update k8s repo (#647)

Co-authored-by: Stavros Kontopoulos <[email protected]>

openshift/ci-operator/build-image/kubernetes.repo

@@ -1,7 +1,6 @@
 [kubernetes]
 name=Kubernetes
-baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
+baseurl=https://pkgs.k8s.io/core:/stable:/v1.29/rpm/
 enabled=1
 gpgcheck=1
-repo_gpgcheck=0
-gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
+gpgkey=https://pkgs.k8s.io/core:/stable:/v1.29/rpm/repodata/repomd.xml.key