Rolling v8/third_party/depot_tools:
https://chromium.googlesource.com/chromium/tools/depot_tools/+log/2b2aec6..dd2f620

The roller is blocked since a few weeks, but we need this roll now to
fix a depot_tools version mismatch between the presubmit bots on CQ and
on the waterfall.

R=zhin@chromium.org
TBR=machenbach@chromium.org,tmrts@chromium.org
NOTREECHECKS=true

Bug: chromium:1075618
Change-Id: Ib3e4b2ad4d79a1b35db1b320c7f7aa682b1eab90
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2166198
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67404}