This is always recommended, since wheel availability varies between
minor versions. We may not support major-version-only specifiers
in the future.

Change-Id: Ib41426fa39212fe3e49d87c1d1c8b5bbc49aef7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3708295Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>
Auto-Submit: Brian Ryner <bryner@google.com>