setup_cipd: use newer version of protoc-gen-go(-grpc)?

These produce modern Go generated messages. There's an extra TODO in
here to use CIPD-based binaries, but that's not quite ready yet.

BUG=chromium:1174238,chromium:1165962
TEST=we'll see once it's submitted

Change-Id: Ib3bedfc9ffa24f144b97faf57febadc6e4a2b574
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2673904
Reviewed-by: Prathmesh Prabhu <pprabhu@google.com>
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
154 files changed