[Compose] Update SOGo, add new var to watchdog

docker-compose.yml

@@ -147,7 +147,7 @@ services:
             - phpfpm
 
     sogo-mailcow:
-      image: mailcow/sogo:1.68
+      image: mailcow/sogo:1.69
       environment:
         - DBNAME=${DBNAME}
         - DBUSER=${DBUSER}
@@ -388,6 +388,7 @@ services:
         - USE_WATCHDOG=${USE_WATCHDOG:-n}
         - WATCHDOG_NOTIFY_EMAIL=${WATCHDOG_NOTIFY_EMAIL}
         - WATCHDOG_NOTIFY_BAN=${WATCHDOG_NOTIFY_BAN:-y}
+        - WATCHDOG_EXTERNAL_CHECKS=${WATCHDOG_EXTERNAL_CHECKS:-n}
         - MAILCOW_HOSTNAME=${MAILCOW_HOSTNAME}
         - IPV4_NETWORK=${IPV4_NETWORK:-172.22.1}
         - IP_BY_DOCKER_API=${IP_BY_DOCKER_API:-0}