Upgrade xz-embedded to d4a9bc83c72d8087fe36ff388e89599626da7873 am: 31ddfa643c

Original change: https://android-review.googlesource.com/c/platform/external/xz-embedded/+/3108998

Change-Id: I0525021aee6b40ff9dbbe7aeb62d8620840c6e4a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>