Remove deprecated bases from default kustomization

Author: stefanprodan

config/default/kustomization.yaml

@@ -1,9 +1,8 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 namespace: source-system
-bases:
+resources:
 - ../crd
 - ../rbac
 - ../manager
-resources:
-  - namespace.yaml
+- namespace.yaml