OpenJDK 21 is the latest Long-Term Support (LTS) release of the Java platform.

* https://fedoraproject.org/wiki/Changes/Java21

For a list of major changes from OpenJDK 17 (java-17-openjdk), see the upstream
release page for OpenJDK 17 and the preceding interim releases:

* 18: https://openjdk.java.net/projects/jdk/18
* 19: https://openjdk.java.net/projects/jdk/19
* 20: https://openjdk.java.net/projects/jdk/20
* 21: https://openjdk.java.net/projects/jdk/21