[Unbound] Update base to Alpine 3.10 to use Unbound 1.9

[Unbound] Set unwanted-reply-threshold: 10000

data/Dockerfiles/unbound/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.9
+FROM alpine:3.10
 
 LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 

data/conf/unbound/unbound.conf

@@ -32,6 +32,7 @@ server:
   hide-version: yes
   max-udp-size: 4096
   msg-buffer-size: 65552
+  unwanted-reply-threshold: 10000
 
 remote-control:
     control-enable: yes

docker-compose.yml

@@ -2,7 +2,7 @@ version: '2.1'
 services:
 
     unbound-mailcow:
-      image: mailcow/unbound:1.7
+      image: mailcow/unbound:1.8
       build: ./data/Dockerfiles/unbound
       command: /usr/sbin/unbound
       environment: