k8s-authnz-webhook: Update to version master-157

Update 926694233939.dkr.ecr.eu-central-1.amazonaws.com/production_namespace/teapot/k8s-authnz-webhook to version master-157

Author: k8s-on-aws-manager-app[bot]

cluster/node-pools/master-default/userdata.yaml

@@ -289,7 +289,7 @@ write_files:
             - mountPath: /etc/kubernetes/ssl
               name: ssl-certs-kubernetes
               readOnly: true
-        - image: 926694233939.dkr.ecr.eu-central-1.amazonaws.com/production_namespace/teapot/k8s-authnz-webhook:master-156
+        - image: 926694233939.dkr.ecr.eu-central-1.amazonaws.com/production_namespace/teapot/k8s-authnz-webhook:master-157
           name: webhook
           ports:
           - containerPort: 8081