Upgrade consensusj-jsonrpc and dependents to Java 17

[msgilligan]

Since release 0.7.0-alpha1 (See https://github.com/ConsensusJ/consensusj/blob/master/CHANGELOG.adoc#dependency-updates-2) most modules are requiring JDK 11.

I am considering consensusj-jsonrpc and dependencies to Java 17 in a future release. If you have a use case that needs us to keep JDK 11 support, please comment.

[msgilligan]

I have updated the build to require JDK 17: See PR #160