chore: Update ironfish rust for frost minimal

[jowparks]

Summary

1. Add ironfish-frost = { git = "https://github.com/iron-fish/ironfish-frost.git" }
2. Update rust-toolchain.toml to channel='nightly' as minimal update is only available on nightly
3. run cargo update -Z minimal-versions -p cpufeatures -p proc-macro2 -p serde
4. revert change to rust-toolchain.toml
5. cargo build success
6. profit

Testing Plan

tests pass

proc-macro2 1.0.59 -> 1.0.76 vs 1.0.60

Documentation

Does this change require any updates to the Iron Fish Docs (ex. the RPC API
Reference)? If yes, link a
related documentation pull request for the website.

[ ] Yes

Breaking Change

Is this a breaking change? If yes, add notes below on why this is breaking and
what additional work is required, if any.

[ ] Yes