Use java 22 instead of 21 with preview features

[CryptForge]

Since the FFM api has fully released in java 22, I think it would better to use that instead.
Java 21 is a LTS release, which could be a reason to stay on 21, but I think requiring preview features negates that benefit.

[mworzala]

My own primary use case this library for is stuck on Java 21 for the moment. I do plan to update to 22 when I can.