Update cf-deployment manifest version to v51.6.0

Author: ard-wg-gitbot

cf-deployment.yml

@@ -1,6 +1,6 @@
 ---
 name: cf
-manifest_version: v51.5.0
+manifest_version: v51.6.0
 update:
   canaries: 1
   canary_watch_time: 30000-1200000
@@ -839,7 +839,7 @@ instance_groups:
       cloud_controller: {as: cloud_controller, shared: true}
     properties:
       name: cf-deployment
-      build: v51.5.0 # AUTO-POPULATED; DO NOT EDIT
+      build: v51.6.0 # AUTO-POPULATED; DO NOT EDIT
       version: 51 # AUTO-POPULATED; DO NOT EDIT
       router:
         route_services_secret: "((router_route_services_secret))"