app-arch/cpio: Uprev to 2.15

Fixes CVE-2021-38185.

BUG=b:268217467
TEST=sudo emerge =app-arch/cpio-2.15

Change-Id: I845ac7491140893bb9b7028fcee2596b0317d9d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/5459211
Commit-Queue: Raul Rangel <rrangel@chromium.org>
Commit-Queue: Tim Bain <tbain@google.com>
Auto-Submit: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Tim Bain <tbain@google.com>
Tested-by: Raul Rangel <rrangel@chromium.org>
7 files changed