Merge "point to new repo hooks for mainline uploads" into rvc-dev am: 1af41a383e am: 33f9a7541e

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/libvpx/+/11605676

Change-Id: Ia4e28057fee4f0384708fe402a5d99101b0f0b67