JOC Cockpit supports Java 21

Current Situation

• JOC Cockpit is available for Java 1.8, 11, 17.
• JOC Cockpit cannot be used with Java 21.

Desired Behavior

• JOC Cockpit supports Java 21.

Maintainer Notes

• An upgrade of the Hibernate libraries was required: 5.5.4.Final -> 5.6.5.Final
• An upgrade of the jersey libraries was also required: 3.0.8 -> 3.0.11