[Compose] Update MariaDB to 10.4; Update PHP-FPM image to include fix

docker-compose.yml

@@ -17,7 +17,7 @@ services:
             - unbound
 
     mysql-mailcow:
-      image: mariadb:10.3
+      image: mariadb:10.4
       depends_on:
         - unbound-mailcow
       stop_grace_period: 45s
@@ -101,7 +101,7 @@ services:
             - rspamd
 
     php-fpm-mailcow:
-      image: mailcow/phpfpm:1.67
+      image: mailcow/phpfpm:1.68
       command: "php-fpm -d date.timezone=${TZ} -d expose_php=0"
       depends_on:
         - redis-mailcow