is-stream converted to pure ESM

[EcksDy]

Heya!

I've stumbled upon this library and intend to give the multi root workspaces setup you've done a try.
It's great work as far as I can tell, thank you for taking the time and publishing!

Unfortunately is-stream dependency has converted to pure ESM in their 3.0.0 version.
I've mitigated it via package.json overrides:

  "overrides": {
    "is-stream": "2.0.1"
  },

I'll open a PR with the downgrade in case you'd want to merge this.

The other approach is to try and dynamically import the module, but I had issues with the setup when I tried to do it that way.