This is a prerequisite to enabling the native Mac ARM64 cpython3,
since we don't have that package built at the old 3.8.0 version.

Bug: 1184767
Change-Id: I68a7de836f9fae25ecbb2fc84aff389a24c32e5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2842053Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Brian Ryner <bryner@google.com>