[Compose] Update olefy to Alpine 3.15

docker-compose.yml

@@ -539,7 +539,7 @@ services:
             - solr
 
     olefy-mailcow:
-      image: mailcow/olefy:1.8
+      image: mailcow/olefy:1.8.1
       restart: always
       environment:
         - TZ=${TZ}