Merge pull request #9338 from zalando-incubator/926694233939.dkr.ecr.eu-central-1.amazonaws.com/production_namespace/teapot/admission-controller

admission-controller: Update to version master-257

Author: katyanna

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

@@ -216,7 +216,7 @@ write_files:
             limits:
               memory: {{ .Values.InstanceInfo.MemoryFraction (parseInt64 .Cluster.ConfigItems.apiserver_memory_limit_percent)}}
 {{- end }}
-        - image: 926694233939.dkr.ecr.eu-central-1.amazonaws.com/production_namespace/teapot/admission-controller:master-254
+        - image: 926694233939.dkr.ecr.eu-central-1.amazonaws.com/production_namespace/teapot/admission-controller:master-257
           name: admission-controller
           lifecycle:
             preStop: