Update risc0 version or find a way to pin the previous one

[MauroToscano]

[PatStiles]

risc0 says version control for its toolchain is a known issue: https://discord.com/channels/953703904086994974/1290498126049841232

After further investigation we found we can work around issues with installing a past toolchain by having users generate proof using the risc0-zkvm with the prove feature enabled ref: https://github.com/yetanotherco/aligned_layer/blob/testnet/examples/validating-public-input/risc_zero/fibonacci_proof_generator/host/Cargo.toml#L9. If they have issues installing a past version of cargo-risczero via rzup we can refer them to the discord channel above.