In preparation to a new release let's bump up minor versions of both
prod and dev images to 12.
BRANCH=none
BUG=none
TEST=built images and verified version number
Change-Id: I55979374f5e3e21fedde128410c4861e4c2ad9c4
Reviewed-on: https://chromium-review.googlesource.com/417883
Commit-Ready: Vadim Bendebury <vbendeb@chromium.org>
Tested-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-by: Andrey Pronin <apronin@chromium.org>