go-nanoid requires updating in order to fix build with Go 1.14

Go in Homebrew is currently 1.14. `tunnel-client` is no longer able to be built from source since go-nanoid contains invalid go.mod syntax:

```
go: github.com/matoous/go-nanoid@v1.1.0: parsing go.mod: go.mod:1: usage: go 1.23
```

go-nanoid 1.2.0 and later fixes this issue.