Changing cow version to read from build am: c145c71e28 am: b3cea8c79c

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2577011

Change-Id: I71be019a5978538ce0025576853ea158739ee767
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>