Upgrade python-exec to match ChromeOS

To do the ChromeOS rebase, we need to update python-exec and rebuild our
SDK. The in-place update for python-exec appears broken.

BUG=b/257271340
TEST=presubmit
RELEASE_NOTE=None

Change-Id: I8bc9f2044c4f37a10888478e7f1504a1b09286b4
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/39148
Reviewed-by: Oleksandr Tymoshenko <ovt@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
16 files changed