[Compose] Update PHP-FPM image

data/Dockerfiles/phpfpm/Dockerfile

@@ -36,6 +36,7 @@ RUN apk add -U --no-cache autoconf \
   mysql-client \
   openldap-dev \
   pcre-dev \
+  re2c \
   redis \
   samba-client \
   zlib-dev \

docker-compose.yml

@@ -207,7 +207,7 @@ services:
             - dovecot
 
     postfix-mailcow:
-      image: mailcow/postfix:1.14
+      image: mailcow/postfix:1.15
       build: ./data/Dockerfiles/postfix
       volumes:
         - ./data/conf/postfix:/opt/postfix/conf