Getting error using brew install grpcui

I am trying to install grpcui on my mac and I get the following error:

```
_Error: go: undefined method `kernel_name' for OS:Module
Did you mean? kernel_version_
```

Start by reproducing the reported `brew install grpcui` failure on macOS and compare the error with the repository's installation context. Identify whether the `kernel_name` error is caused by grpcui or by a dependency, then verify that the installation completes successfully after the appropriate fix.

Written by the indexing model from the issue text.