Bump SDK revision number to ship an update with Beta 4 am: d16b8ab5ba

Original change: https://googleplex-android-review.googlesource.com/c/platform/development/+/19014235

Change-Id: I14f1ff3203fe4fd1d7b1104aa16fc9c5a720f895
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>