grep: upgraded package to upstream

Upgraded sys-apps/grep to version 3.7 on amd64, arm, arm64

BUG=b:206710597
TEST=CQ passes

Change-Id: I8d7a4f45b4ee27232d0e9b5caa7e29e43ff9c834
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3288483
Reviewed-by: Sam McNally <sammc@chromium.org>
Tested-by: David Jimenez <dvjimenez@chromium.org>
Commit-Queue: David Jimenez <dvjimenez@chromium.org>
3 files changed