update dice-util deps #11665

This is slightly more complex than just updating the dependencies, but not by much.

There are two distinct parts to this work:

• pull in updated Attest trait w/ new async impls
• account for type renames & repo reorg

The first part should simplify the impl in sled-agent significantly as it will no longer need to hack around the lack of async compatibility. The second should be a simple find / replace on a few type names while accounting for some that have been moved to a dedicated crate that drives interaction with the oxide rot. The changes here will be limited accounting for code moved between crates in the dice-util repo & renaming types. All changes are backward compatible with the existing interfaces (see oxidecomputer/dice-util#445).

Keeping these two changes separate isn't strictly required but is expected to simplify review. I haven't been able to find any tests that cover this code so adding a few before making these changes would be a good way to ensure the work described here doesn't change any of the existing behavior.