[Netfilter] Fix Netfilter image

data/Dockerfiles/netfilter/Dockerfile

@@ -5,9 +5,8 @@ ENV XTABLES_LIBDIR /usr/lib/xtables
 ENV PYTHON_IPTABLES_XTABLES_VERSION 12
 ENV IPTABLES_LIBDIR /usr/lib
 
-RUN echo 'http://dl-cdn.alpinelinux.org/alpine/v3.9/main' >> /etc/apk/repositories \
-  && apk add --virtual .build-deps gcc python3-dev libffi-dev openssl-dev \
-  && apk add -U python3 iptables=1.6.2-r1 ip6tables=1.6.2-r1 tzdata musl-dev \
+RUN apk add --virtual .build-deps gcc python3-dev libffi-dev openssl-dev \
+  && apk add -U python3 iptables ip6tables tzdata musl-dev \
   && pip3 install --upgrade pip python-iptables redis ipaddress dnspython \
 #  && pip3 install --upgrade pip python-iptables==0.13.0 redis ipaddress dnspython \
   && apk del .build-deps

docker-compose.yml

@@ -378,7 +378,7 @@ services:
             - acme
 
     netfilter-mailcow:
-      image: mailcow/netfilter:1.36
+      image: mailcow/netfilter:1.37
       stop_grace_period: 30s
       depends_on:
         - dovecot-mailcow