Update kubernetes packages to v0.28.0

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

go.mod

@@ -6,10 +6,10 @@ require (
 	github.com/cert-manager/cert-manager v1.8.1
 	github.com/go-logr/logr v1.2.3
 	github.com/stretchr/testify v1.8.0
-	k8s.io/api v0.23.5
-	k8s.io/apiextensions-apiserver v0.23.5
-	k8s.io/apimachinery v0.23.5
-	k8s.io/client-go v0.23.5
+	k8s.io/api v0.28.0
+	k8s.io/apiextensions-apiserver v0.28.0
+	k8s.io/apimachinery v0.28.0
+	k8s.io/client-go v0.28.0
 	sigs.k8s.io/controller-runtime v0.11.2
 	sigs.k8s.io/controller-tools v0.7.0
 )