chore: upgrade to iroh v0.30.0

[ramfox]

blockers:

• now that iroh::tls is private, I'm not sure exactly what should replace iroh::tls::make_client::config. Can we use normal certs? or does it have to use keypairs?

Edit:
moved the entire iroh::tls module into content-discovery there is now a content-discovery::tls crate