Move to Java 21 - #240
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This PR updates the Java version from 11 to 21 to align with the current Java version used in the scijava/fiji universe. The base pom-scijava already starts pulling in Java 21 dependencies that would need to be manually removed, so this is the clear long-term solution.
Besides some trivial pins / exclusions, the update to Java 21 requires some non-trivial version changes:
/misc/sc/jdks/zulu21to the JDK21 that's already there