ci: use official zookeeper image

Former one ate almost all of my free memory for some reason. This
one looks more predictable.

.ci/docker-compose-file/docker-compose-kafka.yaml

@@ -2,7 +2,7 @@ version: '3.9'
 
 services:
   zookeeper:
-    image: wurstmeister/zookeeper
+    image: docker.io/library/zookeeper:3.6
     ports:
       - "2181:2181"
     container_name: zookeeper