Merge "fallback on older cow version" into main am: 4fc78150

Original change: https://android-review.googlesource.com/c/platform/build/+/2982349



Change-Id: I29b2ca63b0e52184f3885272a1da98a0e25cbb7b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>