all: auto-regenerate gapics

This is an auto-generated regeneration of the gapic clients by
cloud.google.com/go/internal/gapicgen. Once the corresponding genproto PR is
submitted, genmgr will update this CL with a newer dependency to the newer
version of genproto and assign reviewers to this CL.

If you have been assigned to review this CL, please:

- Ensure that the version of genproto in go.mod has been updated.
- Ensure that CI is passing. If it's failing, it requires your manual attention.
- +2 and submit this CL if you believe it's ready to ship.

Corresponding genproto PR: googleapis/go-genproto#317

Change-Id: I548f0a55a5dd1510718250fccc039f9db68e455b
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/52832
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Tyler Bui-Palsulich <tbp@google.com>