ci: Bump kustomize to v5.3.0

The current kustomize version used in Makefile (v3.8.7) was released
on Nov, 2020 and does not support aarch64, ppc64le and s390x.

This is to bump the version to the latest.

Fixes: #323

Signed-off-by: Hyounggyu Choi <Hyounggyu.Choi@ibm.com>

Makefile

@@ -184,7 +184,7 @@ ENVTEST ?= $(LOCALBIN)/setup-envtest
 OPERATOR_SDK ?= $(LOCALBIN)/operator-sdk
 
 ## Tool Versions
-KUSTOMIZE_VERSION ?= v3.8.7
+KUSTOMIZE_VERSION ?= v5.3.0
 CONTROLLER_TOOLS_VERSION ?= v0.9.2
 OPERATOR_SDK_VERSION ?= v1.30.0