chore: add patch for iroh dependencies (#76)

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

Cargo.lock

@@ -44,3 +44,7 @@ nix = { version = "0.29", features = ["signal", "process"] }
 rand = "0.8.5"
 serde_json = "1.0.108"
 tempfile = "3.8.1"
+
+[patch.crates-io]
+iroh = { git = "https://github.com/n0-computer/iroh.git", branch = "main" }
+iroh-blobs = { git = "https://github.com/n0-computer/iroh-blobs.git", branch = "main" }