Update Rust version in versions.nix file

[k3rn3lpanicc]

Bump Rust to 1.79 in versions.nix

Summary

Align versions.nix with rust-toolchain.toml by updating Rust from 1.77 → 1.79 to reflect the current repository state and resolve build failures.

Motivation

Builds using BUILD.md (both Docker and Nix paths) failed because several dependencies require Rust 1.79, while versions.nix still pinned 1.77. This mismatch led to compilation errors.

What Changed

• Updated Rust version in versions.nix to 1.79.

Impact

• Fixes build errors in both Docker and Nix workflows.
• No runtime or API changes; this is a tooling alignment.
• No breaking changes expected.

Testing

• Verified successful builds using:
  • nix build per BUILD.md
  • Docker-based build instructions in BUILD.md
• Compilation succeeds where it previously failed with 1.77.

Documentation

• BUILD.md references remain valid; the underlying version now matches the documented toolchain.

Risks & Mitigations

• Minimal risk: upgrade only matches the already-declared toolchain (rust-toolchain.toml).
• If consumers are pinned to 1.77 locally, rustup will fetch 1.79 automatically.

Related

• Toolchain source of truth: rust-toolchain.toml (1.79)