go.mod: update infra/proto and grpc deps

This required changing some comparators in generator_test.go, but that
change makes things better.

BUG=chromium:1174238
TEST=unit tests

Change-Id: I9b31d5b8e6f3bf9c8a4144971cb4ed1cdc2c0dff
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/go/+/2674073
Reviewed-by: Prathmesh Prabhu <pprabhu@google.com>
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
Tested-by: Sean Abraham <seanabraham@chromium.org>
3 files changed