Update kubernetes packages to v0.28.4

go.mod

@@ -13,11 +13,11 @@ require (
 	github.com/redhat-cop/operator-utils v1.1.4
 	github.com/scylladb/go-set v1.0.2
 	github.com/stretchr/testify v1.6.1
-	k8s.io/api v0.20.2
-	k8s.io/apiextensions-apiserver v0.20.1
-	k8s.io/apimachinery v0.20.2
-	k8s.io/client-go v0.20.2
-	k8s.io/kube-aggregator v0.20.1
-	k8s.io/kubectl v0.20.2
+	k8s.io/api v0.28.4
+	k8s.io/apiextensions-apiserver v0.28.4
+	k8s.io/apimachinery v0.28.4
+	k8s.io/client-go v0.28.4
+	k8s.io/kube-aggregator v0.28.4
+	k8s.io/kubectl v0.28.4
 	sigs.k8s.io/controller-runtime v0.8.3
 )