Upgrade kustomize (#241)

Author: davidkarlsen

Makefile

@@ -183,7 +183,7 @@ CONTROLLER_GEN ?= $(LOCALBIN)/controller-gen
 ENVTEST ?= $(LOCALBIN)/setup-envtest
 
 ## Tool Versions
-KUSTOMIZE_VERSION ?= v5.3.0
+KUSTOMIZE_VERSION ?= v5.6.0
 CONTROLLER_TOOLS_VERSION ?= v0.16.1
 
 KUSTOMIZE_INSTALL_SCRIPT ?= "https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/hack/install_kustomize.sh"