Remove rspamd custom version

docker-compose.override.yml

@@ -1,4 +1,3 @@
-version: '2.1'
 services:
 
     nginx-mailcow:
@@ -43,9 +42,6 @@ services:
       restart: "no"
       entrypoint: ["echo", "ipv6nat disabled in compose.override.yml"]
 
-    rspamd-mailcow:
-      image: mailcow/rspamd:1.92
-
 networks:
   mailcow-network:
     driver_opts: