Update go.chromium.org/luci to the latest version.

This is the result of running:

```
go get go.chromium.org/luci@latest
go mod tidy
```

And then fixing the "go test ./..." error.

This is preparation for picking up
https://chromium-review.googlesource.com/c/6963499

R=cdelagarza@google.com

Change-Id: Ife13d36240d93bb078582e3bce361f145c0bf6fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/6961193
Tested-by: Vadim Shtayura <vadimsh@chromium.org>
Reviewed-by: Julio Hurtado <juahurta@google.com>
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>
3 files changed