nettle: upgraded package to upstream

Upgraded dev-libs/nettle to version 3.7.3 on amd64

BUG=chromium:1242666
TEST=./build_packages --board=${BOARD}

Change-Id: I5fc192ccc93eee78e6c4dbcb1d11f0b7e02b201d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3114220
Tested-by: Allen Webb <allenwebb@google.com>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
Commit-Queue: Allen Webb <allenwebb@google.com>
3 files changed