Migrate admissionregistration to v1 api (#48)

Author: mahlunar

config/default/webhookcainjection_patch.yaml

@@ -7,7 +7,7 @@ metadata:
   annotations:
     cert-manager.io/inject-ca-from: $(CERTIFICATE_NAMESPACE)/$(CERTIFICATE_NAME)
 ---
-apiVersion: admissionregistration.k8s.io/v1beta1
+apiVersion: admissionregistration.k8s.io/v1
 kind: ValidatingWebhookConfiguration
 metadata:
   name: validating-webhook-configuration