Use previous version of powerdns image, newer version is broken

Author: jc21

docker/docker-compose.ci.yml

@@ -32,7 +32,7 @@ services:
           - ca.internal
 
   pdns:
-    image: pschiffe/pdns-mysql
+    image: pschiffe/pdns-mysql:4.8
     volumes:
       - '/etc/localtime:/etc/localtime:ro'
     environment:

docker/docker-compose.dev.yml

@@ -75,7 +75,7 @@ services:
       - npm
 
   npm-pdns:
-    image: pschiffe/pdns-mysql
+    image: pschiffe/pdns-mysql:4.8
     container_name: "npm.pdns"
     volumes:
       - '/etc/localtime:/etc/localtime:ro'