b2: upgraded package to upstream

Upgraded dev-util/b2 to version 4.9.3 on amd64

BUG=b:268190737
TEST=Build herobrine image

Cq-Depend: chromium:4237138
Change-Id: Ib1ca40cd78303560c4a1a6a2d227fbd56edd6f1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/4235872
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Commit-Queue: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
10 files changed