- POM and JavaDoc updates to get a clean (warning free) build, remove duplicates, etc
- Ensured CI uses the release build profile (i.e. 'ossrh') to ensure we can execute all things necessary for a release. This will not deploy to ossrh however, as we do that manually during a release per https://github.com/jwtk/jjwt/wiki#release-instructions
- Fixing JavaDoc lint errors surfacing on JDK 14
- Enable html5 for JavaDoc on JDK >= 9
- Used version properties and Maven profiles to allow the japicmp-maven-plugin to work with JDK 7 through 18
- Minor CI job name fixes, added additional zulu JDK versions
- Fixed build to run on all JDKs, from 7 to 18 inclusive