Update the "vpython" CIPD version to pick up schema and runtime
performance changes.

BUG=None
TEST=None
R=iannucci@chromium.org

Change-Id: If0e3c393abb16b8918b5fa16593a8788ef8947ec
Reviewed-on: https://chromium-review.googlesource.com/527608Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Commit-Queue: Daniel Jacques <dnj@chromium.org>