dev-python/lxml: Upgrade to 4.9.2

BUG=b:269010286
TEST=./update_chroot

Change-Id: Id9eb448a37a4f63c15910ad913e1d3f8bcf9e883
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/4292353
Commit-Queue: Allen Webb <allenwebb@google.com>
Tested-by: Allen Webb <allenwebb@google.com>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
3 files changed