fix(deps): Update MSRV to 1.85 and migrate to Edition 2024

[nabetti1720]

Issue # (if available)

Fixed #303

Description of changes

Update the crate to Edition 2024 and set the MSRV to 1.85, aligning it with current dependency requirements.

This also enables the MSRV-aware resolver. By regenerating Cargo.lock using Rust 1.85, Cargo can select dependency versions compatible with the declared MSRV; consequently, you do not need to raise the crate's MSRV to 1.89 simply because the latest version of aes requires Rust 1.89.

In the new version, parts of the code were automatically corrected by cargo fix, so they appear as diffs.

[tarcieri]

The idea behind the MSRV-aware resolver is that if clients can select a compatible version of aes, all of the downstream consumers don't have to bump MSRV too

[nabetti1720]

I tried a few approaches after reverting the CI's MSRV to 1.85.0, but none of them seem to work. I suppose the only remaining option is to pin aes to version 0.9.2. Do you have any other suggestions?

[tarcieri]

Use the MSRV as your current rust version when running the update, and the MSRV-aware resolver should select compatible versions

[nabetti1720]

If RustVersion remains set to 1.75, aes@0.9.3 is selected, even if you specify 1.85 in cargo update. On the other hand, if you specify RustVersion as 1.85, aes@0.9.2 is selected, as expected.
Is this behavior expected? In other words, should I set rust-version = "1.85" in this repository?

Cargo.toml of the latest commit:

% cat Cargo.toml | grep rust-version
rust-version = "1.75"

% CARGO_RESOLVER_INCOMPATIBLE_RUST_VERSIONS=fallback rustup run 1.85.0 cargo update
    Updating crates.io index
     Locking 3 packages to latest Rust 1.75 compatible versions
    Updating aes v0.9.2 -> v0.9.3 (requires Rust 1.89)
 Downgrading base64ct v1.8.3 -> v1.6.0 (available: v1.8.3, requires Rust 1.85)
 Downgrading zeroize v1.9.0 -> v1.8.2 (available: v1.9.0, requires Rust 1.85)

After version adjustments:

% cat Cargo.toml | grep rust-version
rust-version = "1.85"

% CARGO_RESOLVER_INCOMPATIBLE_RUST_VERSIONS=fallback rustup run 1.85.0 cargo update
    Updating crates.io index
     Locking 3 packages to latest Rust 1.85 compatible versions
 Downgrading aes v0.9.3 -> v0.9.2 (available: v0.9.3, requires Rust 1.89)
    Updating base64ct v1.6.0 -> v1.8.3
    Updating zeroize v1.8.2 -> v1.9.0

[tarcieri]

1.75 is definitely wrong. All of the dependencies are 2024 edition so it should be bumped to 1.85 and the edition bumped to 2024 too (the MSRV aware resolver wasn't introduced until 1.84 anyway)