[vpython] Roll CIPD version.
[vpython] Roll CIPD version.

Roll CIPD version to:
bbb30ff0932ace4c6bed7ca1ba14e8a1ccc819cb

TBR=iannucci@chromium.org
BUG=chromium:771277
TEST=canary

Change-Id: I4fb064dcad7072a6a4f728f6c6384a8a65ad56a3
Reviewed-on: https://chromium-review.googlesource.com/701434
Reviewed-by: Daniel Jacques <8400006a9338a0893dca0101ad49838955bd6b2c@chromium.org>
Commit-Queue: Daniel Jacques <8400006a9338a0893dca0101ad49838955bd6b2c@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools