gnutls: upgraded package to upstream

Upgraded net-libs/gnutls to version 3.7.6 on amd64, arm64

BUG=b/244292308
TEST=sponge2/87c386fb-d814-48cf-8453-de364a3c8352
RELEASE_NOTE=upgrade gnutls to 3.7.6 and fix CVE-2021-4209

Change-Id: Ie1ffa3beb1285747e8d2b1b64857e601cefd8f3e
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/36556
Reviewed-by: Meena Shanmugam <meenashanmugam@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
5 files changed