CI: Configure JRuby: use javac --release, JRUBY_OPTS=--debug, use Java 21 #60
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This PR changes the JRuby test situation.
First, I avoided some deprecation warnings. Then, I also changed the running Java version, which allowed jruby-head to build.
It avoids using --source 1.8 and --target 1.8, to side-step a build warning.
The result is:
--release=8
is used in the javac compilation command.Details about: jruby-head test failures about no superclass method
Fixes #59