feat!: update to iroh@v0.30.0 and MSRV 1.81

---------

Co-authored-by: “ramfox” <“kasey@n0.computer”>
Co-authored-by: dignifiedquire <me@dignifiedquire.com>

Author: 3 people

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ on:
       - main
 
 env:
-  MSRV: "1.63"
+  MSRV: "1.81"
   RUST_BACKTRACE: 1
   RUSTFLAGS: -Dwarnings
   IROH_FORCE_STAGING_RELAYS: "1"