flake.lock: Update (#52)

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/5635c32d666a59ec9a55cab87e898889869f7b71?narHash=sha256-MhA7wmo/7uogLxiewwRRmIax70g6q1U/YemqTGoFHlM%3D' (2025-12-11)
  → 'github:hercules-ci/flake-parts/a34fae9c08a15ad73f295041fec82323541400a9?narHash=sha256-XswHlK/Qtjasvhd1nOa1e8MgZ8GS//jBoTqWtrS1Giw%3D' (2025-12-15)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/5daac62b13d199f663a61a523910e1d001c6cf83?narHash=sha256-z4JfmnzGlCLkFMkGYoR1ujudZudbsOus86X6Egsn6cY%3D' (2025-12-13)
  → 'github:NixOS/nixpkgs/f03e59b1111c68b721b20bb72ee7d7e079d38a0f?narHash=sha256-JuS4ucoXQOfaNDVL47oTHp%2BnRCI3OwlAhpOINCixdhw%3D' (2025-12-20)
• Updated input 'pre-commit':
    'github:cachix/git-hooks.nix/09e45f2598e1a8499c3594fe11ec2943f34fe509?narHash=sha256-dixPWKiHzh80PtD0aLuxYNQ0xP%2B843dfXG/yM3OzaYQ%3D' (2025-12-11)
  → 'github:cachix/git-hooks.nix/b68b780b69702a090c8bb1b973bab13756cc7a27?narHash=sha256-t3T/xm8zstHRLx%2BpIHxVpQTiySbKqcQbK%2Br%2B01XVKc0%3D' (2025-12-16)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/348b94ed9ddffccdf1a65582a2dcff0a4a3eeeb4?narHash=sha256-qbl874bCIy9%2BOLImdfBfZ9ITUDDjjTAB04Dk4PlZFV0%3D' (2025-12-13)
  → 'github:oxalica/rust-overlay/66bb33fdfb50b1ee724381c3f5d6012dac6c89b3?narHash=sha256-f1L1rCEu2Zew6zdiZ38jJDZd65ktE7UN%2BGqn2LHPiFI%3D' (2025-12-20)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/5b4ee75aeefd1e2d5a1cc43cf6ba65eba75e83e4?narHash=sha256-AlEObg0syDl%2BSpi4LsZIBrjw%2BsnSVU4T8MOeuZJUJjM%3D' (2025-11-12)
  → 'github:numtide/treefmt-nix/42d96e75aa56a3f70cab7e7dc4a32868db28e8fd?narHash=sha256-%2BcqN4PJz9y0JQXfAK5J1drd0U05D5fcAGhzhfVrDlsI%3D' (2025-12-17)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]