A+C: update for release

This is an automated update for the main branch of the main repo.
Some special cases and other repos will follow.

Updates #10639

Change-Id: I4b149c037e9292b7e323a9f4c009092ce6b70ce5
Reviewed-on: https://go-review.googlesource.com/12159Reviewed-by: Andrew Gerrand <adg@golang.org>