[Backport] [2.x] Update spotless to meet JDK-21 baseline (#618)#627

Merged

ansjcy merged 1 commit intoopensearch-project:2.xfrom reta:backport/backport-618-to-2.x

Feb 9, 2024

+32-60

Commits on Feb 9, 2024

Update spotless to meet JDK-21 baseline (opensearch-project#618 )
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