Update build-tools to ab/7855960 am: 968c105d60 am: 961ef7afbc am: 3d16ffb214 am: cc33919766 am: fbc93dbedb

Original change: https://android-review.googlesource.com/c/platform/prebuilts/build-tools/+/1870836

Change-Id: Ifbacb7641820765030827df42af5fb7d192537bd