Unable to go install tagged version since introduction of `v` prefix

```
$ go install github.com/bazelbuild/buildtools/buildifier@6.1.1
go: downloading github.com/bazelbuild/buildtools v0.0.0-20230425225026-3dcc8d67e8ea
```

Then for every version after the introduction of the `v` prefix:

```
$ go install github.com/bazelbuild/buildtools/buildifier@v6.4.0
go: github.com/bazelbuild/buildtools/buildifier@v6.4.0: github.com/bazelbuild/buildtools@v6.4.0: invalid version: module contains a go.mod file, so module path must match major version ("github.com/bazelbuild/buildtools/v6")
```

```
$ go version
go version go1.21.6 darwin/arm64
```