expat: upgraded package to upstream

Upgraded dev-libs/expat to version 2.7.0.

BUG=b/403841440
TEST=presubmit + local emerge-
RELEASE_NOTE=Updated dev-libs/expat to v2.7.0. This fixes CVE-2024-8176.

Change-Id: Ib6e3aed87beaba2e651f14664bccb5aa0f7153fc
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/96839
Main-Branch-Verified: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Tested-by: Arnav Kansal <rnv@google.com>
Reviewed-by: Kevin Berry <kpberry@google.com>
2 files changed