Update default PostgreSQL version to 13

Changed the default PostgreSQL version from 12 to 13 in both the setup script and the JSON configuration. Also removed a redundant password change warning from the JSON notes.

ct/postgresus.sh

@@ -11,7 +11,7 @@ var_cpu="${var_cpu:-2}"
 var_ram="${var_ram:-2048}"
 var_disk="${var_disk:-8}"
 var_os="${var_os:-debian}"
-var_version="${var_version:-12}"
+var_version="${var_version:-13}"
 var_unprivileged="${var_unprivileged:-1}"
 
 header_info "$APP"

frontend/public/json/postgresus.json

@@ -24,7 +24,7 @@
                 "ram": 2048,
                 "hdd": 8,
                 "os": "Debian",
-                "version": "12"
+                "version": "13"
             }
         }
     ],
@@ -33,10 +33,6 @@
         "password": "See /root/postgresus.creds"
     },
     "notes": [
-        {
-            "text": "Change the default password after first login for security",
-            "type": "warning"
-        },
         {
             "text": "Supports PostgreSQL versions 12-18 with cloud and self-hosted instances",
             "type": "info"