Require JDK 17 for building & update plugins and dependencies

[Marcono1234]

Purpose

Require JDK 17 for building, and applies some of the version updates of #2914

Description

Applies the version updates of #2914 which require JDK 17 or newer. I have omitted the other version updates to keep this cleaner; they can be applies independently afterwards.

The CI build still runs on JDK 11 as well (but with a custom configuration) to ensure that Gson works on a version without Record classes properly as well.

Checklist

• New code follows the Google Java Style Guide
  This is automatically checked by mvn verify, but can also be checked on its own using mvn spotless:check.
  Style violations can be fixed using mvn spotless:apply; this can be done in a separate commit to verify that it did not cause undesired changes.
• If necessary, new public API validates arguments, for example rejects null
• New public API has Javadoc
  • Javadoc uses @since $next-version$
    ($next-version$ is a special placeholder which is automatically replaced during release)
• If necessary, new unit tests have been added
  • Assertions in unit tests use Truth, see existing tests
  • No JUnit 3 features are used (such as extending class TestCase)
  • If this pull request fixes a bug, a new test was added for a situation which failed previously and is now fixed
• mvn clean verify javadoc:jar passes without errors

[eamonnmcmanus]

Thanks! That's very helpful.