flake.lock: Update

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/5635c32' (2025-12-11)
  → 'github:hercules-ci/flake-parts/a34fae9' (2025-12-15)
• Updated input 'flake-parts/nixpkgs-lib':
    'github:nix-community/nixpkgs.lib/719359f' (2025-10-29)
  → 'github:nix-community/nixpkgs.lib/2075416' (2025-12-14)
• Updated input 'git-hooks-nix':
    'github:cachix/git-hooks.nix/09e45f2' (2025-12-11)
  → 'github:cachix/git-hooks.nix/f092770' (2026-01-01)
• Updated input 'git-hooks-nix/flake-compat':
    'github:edolstra/flake-compat/f387cd2' (2025-10-27)
  → 'github:NixOS/flake-compat/5edf11c' (2025-12-29)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/2fbfb1d' (2025-12-11)
  → 'github:nixos/nixpkgs/fb7944c' (2026-01-02)

Author: pinguibot