Fix error for usnig envtest

Author: atoato88

examples/guestbook-operator/go.mod

@@ -3,10 +3,10 @@ module sigs.k8s.io/kubebuilder-declarative-pattern/examples/guestbook-operator
 go 1.13
 
 require (
-	github.com/go-logr/logr v0.3.0
-	k8s.io/apimachinery v0.20.1
-	k8s.io/client-go v0.20.1
-	sigs.k8s.io/controller-runtime v0.8.0
+	github.com/go-logr/logr v0.4.0
+	k8s.io/apimachinery v0.21.1
+	k8s.io/client-go v0.21.1
+	sigs.k8s.io/controller-runtime v0.9.0
 	sigs.k8s.io/kubebuilder-declarative-pattern v0.0.0
 )