Update conf to disable ipv6

https://mailcow.email/posts/2024/docker-25-ipv6-changes/

docker-compose.override.yml

@@ -52,6 +52,6 @@ networks:
       driver: default
       config:
         - subnet: ${IPV4_NETWORK:-172.22.1}.0/24
-        - subnet: ${IPV6_NETWORK:-fd4d:6169:6c63:6f77::/64}
+        # - subnet: ${IPV6_NETWORK:-fd4d:6169:6c63:6f77::/64}
   proxy:
       external: true