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

Change-Id: I67cc718952add541c7e9b23e531b9f73fedd6c88
Reviewed-on: https://go-review.googlesource.com/c/term/+/583275
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>