* deps: Update iroh, remove default-net patch
The released version of default-net is now sufficient and iroh makes
sure this dependency is recent enough.
* Update cargo-deny config
* Newer version of spin, previous has been yanked
This adds more configuration to cargo-deny so that the output is not a
giant list of warnings hiding new entries. Instead the config now
lists the things that would emit warnings. It also adds -Dwarnings to
the CI job so that new warnings will be cleaned up: they can be added
to the config easily to fix the warnings.
