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

Change-Id: I0cd4e4f8bcf8d72cfe00e80de0259269061ce63b
Reviewed-on: https://go-review.googlesource.com/c/image/+/540596
Reviewed-by: Heschi Kreinick <heschi@google.com>
Auto-Submit: Gopher Robot <gobot@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>