Add hashes for Kubernetes 1.18.16/1.19.8/1.20.4
Add hashes for Kubernetes 1.18.16/1.19.8/1.20.4

kubernetes-sigs/kubespray,kubernetes-sigs/kubespray,Atoms/kubespray,kubernetes-incubator/kargo,kubernetes-sigs/kubespray,Atoms/kubespray,kubernetes-incubator/kargo,Atoms/kubespray,kubernetes-incubator/kubespray,kubernetes-sigs/kubespray,kubernetes-incubator/kubespray,Atoms/kubespray