Update ZooKeeper & Curator to v3.9.6

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This PR contains the following updates:

Package	Type	Update	Change
org.apache.zookeeper:zookeeper (source, changelog)	dependencies	patch	3.9.5 → 3.9.6
org.apache.zookeeper:zookeeper-jute (source, changelog)	dependencies	patch	3.9.5 → 3.9.6

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[epugh]

looks like we get some CVE fixes!

[epugh]

@dsmiley the update means we can drop dropwizard. https://issues.apache.org/jira/browse/ZOOKEEPER-4324 is included in this release. I'm thinking I'll merge this PR, and then in a seperate PR we can remove the dropwizard dependency?