bison: upgraded package to upstream

Upgraded sys-devel/bison to version 3.7.3 on amd64

BUG=chromium:1196911
TEST=CQ

Cq-Depend: chromium:2815201
Change-Id: Ia14976fff9b4ddd05736a52358b9b5c4820ee2be
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2815655
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
6 files changed