Cockpit: Downgrade to Debian 12 Bookworm (45Drives Issue) (#10717)

* Change default var_version from 13 to 12

* Update OS version from 13 to 12 in cockpit.json

ct/cockpit.sh

@@ -11,7 +11,7 @@ var_cpu="${var_cpu:-2}"
 var_ram="${var_ram:-1024}"
 var_disk="${var_disk:-4}"
 var_os="${var_os:-debian}"
-var_version="${var_version:-13}"
+var_version="${var_version:-12}"
 var_unprivileged="${var_unprivileged:-1}"
 
 header_info "$APP"

frontend/public/json/cockpit.json

@@ -23,7 +23,7 @@
         "ram": 1024,
         "hdd": 4,
         "os": "debian",
-        "version": "13"
+        "version": "12"
       }
     }
   ],