[Netfilter] Update to Alpine 3.15 + GeoIP Fix

Added xtables-addon to netfilter container to handle iptables rules with geoip
**Commited by: @marcvorwerk**

data/Dockerfiles/netfilter/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.14
+FROM alpine:3.15
 LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 
 ENV XTABLES_LIBDIR /usr/lib/xtables
@@ -13,6 +13,7 @@ RUN apk add --virtual .build-deps \
 && apk add -U python3 \
   iptables \
   ip6tables \
+  xtables-addons \
   tzdata \
   py3-pip \
   musl-dev \

docker-compose.yml

@@ -420,7 +420,7 @@ services:
             - acme
 
     netfilter-mailcow:
-      image: mailcow/netfilter:1.45
+      image: mailcow/netfilter:1.46
       stop_grace_period: 30s
       depends_on:
         - dovecot-mailcow