Update golang.org/x dependencies to their latest tagged versions.

Change-Id: I0bd2a5d784d250187c82ded58476565d852adb56
Reviewed-on: https://go-review.googlesource.com/c/tools/+/540818
Reviewed-by: Heschi Kreinick <heschi@google.com>
Auto-Submit: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>