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

Change-Id: I6836e5dc5d77c3296197b39403d6f987843017be
Reviewed-on: https://go-review.googlesource.com/c/tools/+/583536
Reviewed-by: Than McIntosh <[email protected]>
Auto-Submit: Gopher Robot <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>