GH-2945: Add Java 21 support #2946
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Rationale for this change
It would be good to check against Java 21 on each change of the code. It looks like the current version of Spotless does not support JDK21. And we cannot upgrade since they dropped Java 8 support: #1377
What changes are included in this PR?
Are these changes tested?
Are there any user-facing changes?