six: upgraded package to upstream

Upgraded dev-python/six to version 1.12.0 on amd64

BUG=chromium:929304
TEST=None

Change-Id: I5c4a68e06d535eac5961871ced9be62193241fa4
Reviewed-on: https://chromium-review.googlesource.com/1450162
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
10 files changed