Revert "pambase: upgraded package to upstream"

This reverts commit 2afce76179846c0d0701274f4d8848958290eecd.

Reason for revert: Validation tests cannot SSH to VMs

Change-Id: I51e12fcd74d8a7b7c7b0d11310dc46be9d6a179a
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/8642
Reviewed-by: Roy Yang <royyang@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
6 files changed