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Dane Pitkin authored and GitHub committed 39298febcd6
GH-36994: [Java] Use JDK 21 in CI (#38219) ### Rationale for this change Verify JDK 21 in CI in time for the Arrow v14 release. ### What changes are included in this PR? * Bump latest Java version from 20 -> 21 in CI ### Are these changes tested? Yes, via CI. ### Are there any user-facing changes? No. * Closes: #36994 Authored-by: Dane Pitkin <dane@voltrondata.com> Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>