build: use released version of iroh 0.4.2

Author: link2xt

Cargo.lock

@@ -59,7 +59,7 @@ hex = "0.4.0"
 hickory-resolver = "0.24"
 humansize = "2"
 image = { version = "0.24.7", default-features=false, features = ["gif", "jpeg", "ico", "png", "pnm", "webp", "bmp"] }
-iroh = { git = "https://github.com/n0-computer/iroh", branch = "maint-0.4", default-features = false }
+iroh = { version = "0.4.2", default-features = false }
 kamadak-exif = "0.5"
 lettre_email = { git = "https://github.com/deltachat/lettre", branch = "master" }
 libc = "0.2"