Bump Kube dependencies to v0.21.1

Set version `v0.21.1` for all Kubernetes modules.

go.mod

@@ -14,14 +14,14 @@ require (
 	github.com/onsi/gomega v1.13.0
 	github.com/spf13/cobra v1.1.3
 	github.com/spf13/viper v1.7.1
-	golang.org/x/crypto v0.0.0-20201002170205-7f63de1d35b0
+	golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83
 	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9
 	golang.org/x/sys v0.0.0-20210423082822-04245dca01da
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
-	k8s.io/api v0.20.5
-	k8s.io/apimachinery v0.20.5
-	k8s.io/cli-runtime v0.20.5
-	k8s.io/client-go v0.20.5
-	k8s.io/kubectl v0.20.5
+	k8s.io/api v0.21.1
+	k8s.io/apimachinery v0.21.1
+	k8s.io/cli-runtime v0.21.1
+	k8s.io/client-go v0.21.1
+	k8s.io/kubectl v0.21.1
 	k8s.io/utils v0.0.0-20201110183641-67b214c5f920
 )