Set MSRV 1.85 & set stable toolchain

[HDauven]

Resolves #274

[Copilot]

Pull request overview

This PR updates the Rust toolchain from a nightly version to stable and sets the MSRV to 1.85, while making minor code improvements including removing unnecessary type conversions and optimizing loop calculations.

Changes:

• Updated Rust toolchain from nightly-2023-11-10 to stable channel
• Set minimum supported Rust version (MSRV) to 1.85 in Cargo.toml
• Optimized permutation loop logic to avoid redundant calculations

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Cargo.toml	Added rust-version field specifying MSRV 1.85
rust-toolchain.toml	Changed toolchain channel from nightly to stable
rustfmt.toml	Removed wrap_comments configuration option
src/hades/permutation.rs	Refactored loop bounds to pre-calculate values and simplify iteration
src/hades/permutation/scalar.rs	Removed redundant as_ref() call on input parameter

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[HDauven]

Blocked by: dusk-network/plonk#857

[moCello]

all good except the changes to the hades permutation

[HDauven]

all good except the changes to the hades permutation

Reverted the changes as requested. There was a clippy warning before in ROUNDS that's no longer there. (or maybe I'm hallucinating)

Only changes now are related to formatting & edition/msrv changes.

[moCello]

LGTM