build(nix): update dependencies

• Updated input 'fenix':
    'github:nix-community/fenix/e8361cc' (2025-12-06)
  → 'github:nix-community/fenix/8456b98' (2025-12-09)
• Updated input 'fenix/nixpkgs':
    'github:nixos/nixpkgs/418468a' (2025-12-02)
  → 'github:nixos/nixpkgs/f61125a' (2025-12-05)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/2cbf358' (2025-12-05)
  → 'github:rust-lang/rust-analyzer/5e3e9c4' (2025-12-07)
• Updated input 'nixify':
    'github:rvolosatovs/nixify/e798dfc' (2025-12-08)
  → 'github:rvolosatovs/nixify/47f0350' (2025-12-09)
• Updated input 'nixify/advisory-db':
    'github:rustsec/advisory-db/30472d9' (2025-12-06)
  → 'github:rustsec/advisory-db/6b4a28c' (2025-12-08)
• Updated input 'nixify/nixpkgs-darwin':
    'github:nixos/nixpkgs/00d2457' (2025-12-05)
  → 'github:nixos/nixpkgs/9393af3' (2025-12-07)
• Updated input 'nixify/rust-overlay':
    'github:oxalica/rust-overlay/7691567' (2025-12-07)
  → 'github:oxalica/rust-overlay/7ed7e8c' (2025-12-08)
• Updated input 'nixpkgs-unstable':
    'github:NixOS/nixpkgs/a672be6' (2025-12-05)
  → 'github:NixOS/nixpkgs/677fbe9' (2025-12-09)

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Author: github-actions[bot]