nghttp2: upgraded package to upstream

Upgraded net-libs/nghttp2 to version 1.40.0 on amd64, arm

BUG=b:154521931
TEST=update_chroot

Change-Id: Icb6d7d1fbbf63e3286142c24e8bd2d3e2a49938a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2195804
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Yilin Yang (kerker) <kerker@chromium.org>
Commit-Queue: Yilin Yang (kerker) <kerker@chromium.org>
3 files changed