ORC-733: Upgrade Zookeeper to 3.6.2 (#625)
ORC-733: Upgrade Zookeeper to 3.6.2 (#625)

### What changes were proposed in this pull request?

This PR aims to upgrade Zookeeper runtime dependency from 2.4.6 to 3.6.2.

### Why are the changes needed?

Zookeeper 2.4.6 has is a known issue on Java 14 environment. This upgrade is recommended by Zookeeper community for Java 14 and also Spark community is currently moving on too.
- https://issues.apache.org/jira/browse/ZOOKEEPER-3779 (Zookeeper client 3.4.x fails to connect when using Java 14)
- https://issues.apache.org/jira/browse/SPARK-34110 (Upgrade ZooKeeper to 3.6.2)

### How was this patch tested?

Pass the CIs.
omalley/orc,apache/orc,apache/orc,omalley/orc,omalley/orc,apache/orc,apache/orc,apache/orc,apache/orc,omalley/orc,apache/orc,apache/orc,omalley/orc,omalley/orc,omalley/orc