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

Change-Id: I1ac4c713a2bdd1c9babb59c7d4a1fe4fbe8fdcd6
Reviewed-on: https://go-review.googlesource.com/c/tools/+/848266
Auto-Submit: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>