libarchive: upgraded package to version 3.7.6

Upgraded app-arch/libarchive to version 3.7.6.

BUG=b/373013031,b/373013574
TEST=presubmit
RELEASE_NOTE=Updated app-arch/libarchive to version 3.7.6. This fixed CVE-2024-48957, CVE-2024-48958.

cos-patch: security-high
Change-Id: I2f476d5c5cc08853d18ea0c43c79166c69147161
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/83521
Reviewed-by: Kevin Berry <kpberry@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Main-Branch-Verified: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Arnav Kansal <rnv@google.com>
5 files changed