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: I1e9402d80906c9bd4a9a1b8e1a71c56b48832818
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>