chore: patch to use main branch of iroh dependencies (#71)

* chore: add patch for `iroh` dependencies

This PR updates the following dependencies to use their main branches:

- `iroh` from `https://github.com/n0-computer/iroh.git`
- `iroh-blobs` from `https://github.com/n0-computer/iroh-blobs.git`

Author: ramfox