Merge pull request #5157 from mailcow/feat/netfilter-1.52

[Netfilter] Update to 1.52

docker-compose.yml

@@ -425,7 +425,7 @@ services:
             - acme
 
     netfilter-mailcow:
-      image: mailcow/netfilter:1.51
+      image: mailcow/netfilter:1.52
       stop_grace_period: 30s
       depends_on:
         - dovecot-mailcow