Merge pull request #148 from cschug/pin_version_bind9

chore: pin version of BIND to 9.18

docker-compose/bind9/docker-compose.yaml

@@ -1,7 +1,7 @@
 ---
 services:
   bind9:
-    image: ubuntu/bind9:latest
+    image: ubuntu/bind9:9.18-23.10_edge
     container_name: bind9
     ports:
       - "53:53"
@@ -9,4 +9,4 @@ services:
       - /etc/bind/:/etc/bind/
       - /var/cache/bind:/var/cache/bind
       - /var/lib/bind:/var/lib/bind
-    restart: unless-stopped
+    restart: unless-stopped