Release on Java 21

[sideeffffect]

Please release on at least Java 21, it's the newest LTS release, still quite fresh. jline publised on Java 22 causes issues in our CI pipeline.
Thank you 🙇

[gnodet]

JLine has one JDK 22 module, so it will definitely not be built on JDK 21.
All jars but jline-terminal-ffm do target JDK 8.
What kind of error do you have ?

[gnodet]

In addition, in case you're using the org.jline:jline big bundle, a JDK 8 version of that bundle is also available, which does not include jline-terminal-ffm: https://repo1.maven.org/maven2/org/jline/jline/3.27.1/jline-3.27.1-jdk8.jar

See #949