Add replace clause back to go.mod

Without the replace clause, release-notes tool failed to find the
version of some libs, i.e., "invalid version: unknown revision v0.0.0"

Author: xing-yang

go.mod

@@ -75,3 +75,57 @@ require (
 replace github.com/kubernetes-csi/external-snapshotter/client/v6 => ./client
 
 replace golang.org/x/net => golang.org/x/net v0.4.0
+
+replace k8s.io/api => k8s.io/api v0.26.0
+
+replace k8s.io/apiextensions-apiserver => k8s.io/apiextensions-apiserver v0.26.0
+
+replace k8s.io/apimachinery => k8s.io/apimachinery v0.26.0
+
+replace k8s.io/apiserver => k8s.io/apiserver v0.26.0
+
+replace k8s.io/cli-runtime => k8s.io/cli-runtime v0.26.0
+
+replace k8s.io/client-go => k8s.io/client-go v0.26.0
+
+replace k8s.io/cloud-provider => k8s.io/cloud-provider v0.26.0
+
+replace k8s.io/cluster-bootstrap => k8s.io/cluster-bootstrap v0.26.0
+
+replace k8s.io/code-generator => k8s.io/code-generator v0.26.0
+
+replace k8s.io/component-base => k8s.io/component-base v0.26.0
+
+replace k8s.io/component-helpers => k8s.io/component-helpers v0.26.0
+
+replace k8s.io/controller-manager => k8s.io/controller-manager v0.26.0
+
+replace k8s.io/cri-api => k8s.io/cri-api v0.26.0
+
+replace k8s.io/csi-translation-lib => k8s.io/csi-translation-lib v0.26.0
+
+replace k8s.io/dynamic-resource-allocation => k8s.io/dynamic-resource-allocation v0.26.0
+
+replace k8s.io/kms => k8s.io/kms v0.26.0
+
+replace k8s.io/kube-aggregator => k8s.io/kube-aggregator v0.26.0
+
+replace k8s.io/kube-controller-manager => k8s.io/kube-controller-manager v0.26.0
+
+replace k8s.io/kube-proxy => k8s.io/kube-proxy v0.26.0
+
+replace k8s.io/kube-scheduler => k8s.io/kube-scheduler v0.26.0
+
+replace k8s.io/kubectl => k8s.io/kubectl v0.26.0
+
+replace k8s.io/kubelet => k8s.io/kubelet v0.26.0
+
+replace k8s.io/legacy-cloud-providers => k8s.io/legacy-cloud-providers v0.26.0
+
+replace k8s.io/metrics => k8s.io/metrics v0.26.0
+
+replace k8s.io/mount-utils => k8s.io/mount-utils v0.26.0
+
+replace k8s.io/pod-security-admission => k8s.io/pod-security-admission v0.26.0
+
+replace k8s.io/sample-apiserver => k8s.io/sample-apiserver v0.26.0