chore(deps): update zookeeper docker tag to v3.9.4 (#2562)

| datasource | package   | from  | to    |
| ---------- | --------- | ----- | ----- |
| docker     | zookeeper | 3.9.3 | 3.9.4 |

Co-authored-by: Renovate Bot <[email protected]>

Author: Fameing

embedded-zookeeper/src/main/java/com/playtika/testcontainers/zookeeper/ZookeeperConfigurationProperties.java

@@ -20,6 +20,6 @@ public class ZookeeperConfigurationProperties extends CommonContainerProperties
     public String getDefaultDockerImage() {
         // Please don`t remove this comment.
         // renovate: datasource=docker
-        return "zookeeper:3.9.3";
+        return "zookeeper:3.9.4";
     }
 }