These are mostly about rolling in Python 3 encoding fixes.

Bug: None
Test: `repo sync` works w/Python 3
Change-Id: I7d749a3a62523a7c802fb0ed7dcd383868df1d6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1809420
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>