git: upgraded package to upstream Upgraded dev-vcs/git to version 2.29.2 for everyone. This includes git init updates for handling master->main better. BUG=chromium:1126855 TEST=CQ passes Change-Id: Iafcde9458fc100a68fcbabad59c8f25d6595e73b Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2569272 Tested-by: Mike Frysinger <vapier@chromium.org> Reviewed-by: LaMont Jones <lamontjones@chromium.org> Commit-Queue: LaMont Jones <lamontjones@chromium.org>