Merge "Allow experimental Java target 21 by default" into main am: bc44eb03

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/3099283



Change-Id: Ie61b0ef0d32a9251b6c284c170acc6cb894aed8f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>