[Compose] Update PHP image

docker-compose.yml

@@ -96,7 +96,7 @@ services:
             - rspamd
 
     php-fpm-mailcow:
-      image: mailcow/phpfpm:1.50
+      image: mailcow/phpfpm:1.51
       build: ./data/Dockerfiles/phpfpm
       command: "php-fpm -d date.timezone=${TZ} -d expose_php=0"
       depends_on: