Bump org.apache.zookeeper:zookeeper from 3.9.3 to 3.9.4 (#5263)

Bumps org.apache.zookeeper:zookeeper from 3.9.3 to 3.9.4.

---
updated-dependencies:
- dependency-name: org.apache.zookeeper:zookeeper
  dependency-version: 3.9.4
  dependency-type: direct:production
...

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Author: dependabot[bot]

pom.xml

@@ -104,7 +104,7 @@
   <properties>
     <revision>1.7.0</revision>
 
-    <zookeeper.version>3.9.3</zookeeper.version>
+    <zookeeper.version>3.9.4</zookeeper.version>
     <curator.version>4.2.0</curator.version>
     <hadoop.version>3.3.4</hadoop.version>
     <hadoop-hdfs-client.artifact>hadoop-hdfs-client</hadoop-hdfs-client.artifact>