Update build-tools to ab/6869517 am: 48542e4070 am: 6e784c8963 am: bbf5892a0d am: 96c7f5eefa

Original change: https://android-review.googlesource.com/c/platform/prebuilts/build-tools/+/1446781

Change-Id: Ie3b362dd9c7b9eee10b5c9ef6633755e0c29bae0