Remove Java21InputAstVisitor until JDK 21 is used am: 78fb69ff70 am: be4a1e47fe

Original change: https://android-review.googlesource.com/c/platform/external/google-java-format/+/2890339

Change-Id: Ia2118fff7dc15c79e8eaa1482286bb274281f8d2
Signed-off-by: Automerger Merge Worker <[email protected]>