Upgraded packages to latest upstream

Upgraded app-arch/pigz to v2.7-r1

BUG=None
TEST=presubmit
RELEASE_NOTE=Upgraded app-arch/pigz to v2.7-r1.

Change-Id: I671be985ccee7375ccc7b777dc6e013a710bf749
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/44509
Reviewed-by: Chenglong Tang <chenglongtang@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
4 files changed