external-dns: Update to version v0.15.1-master-42

Update container-registry.zalando.net/teapot/external-dns to version v0.15.1-master-42

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

cluster/manifests/external-dns/deployment.yaml

@@ -33,7 +33,7 @@ spec:
       serviceAccountName: external-dns
       containers:
       - name: external-dns
-        image: container-registry.zalando.net/teapot/external-dns:v0.14.2-master-41
+        image: container-registry.zalando.net/teapot/external-dns:v0.15.1-master-42
         args:
         - --source=service
         - --source=ingress