Update build-tools to ab/6909298 am: f0d7697ad5 am: 617543557f am: 763009dfb1

Original change: https://android-review.googlesource.com/c/platform/prebuilts/build-tools/+/1463263

Change-Id: Ied02a1c3c4ac345d8ae6170a4f9eedcbd964b01f