[Compose] Use new (patched) Netfilter Image

docker-compose.yml

@@ -424,7 +424,7 @@ services:
             - acme
 
     netfilter-mailcow:
-      image: mailcow/netfilter:1.48
+      image: mailcow/netfilter:1.49
       stop_grace_period: 30s
       depends_on:
         - dovecot-mailcow