flake.lock: Update

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/4524271976b625a4a605beefd893f270620fd751?narHash=sha256-%2BuWLQZccFHwqpGqr2Yt5VsW/PbeJVTn9Dk6SHWhNRPw%3D' (2025-09-01)
  → 'github:hercules-ci/flake-parts/2cccadc7357c0ba201788ae99c4dfa90728ef5e0?narHash=sha256-LlLt2Jo/gMNYAwOgdRQBrsRoOz7BPRkzvNaI/fzXi2Q%3D' (2025-11-21)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/8eb28adfa3dc4de28e792e3bf49fcf9007ca8ac9?narHash=sha256-NOrUtIhTkIIumj1E/Rsv1J37Yi3xGStISEo8tZm3KW4%3D' (2025-09-05)
  → 'github:NixOS/nixpkgs/f61125a668a320878494449750330ca58b78c557?narHash=sha256-BmPWzogsG2GsXZtlT%2BMTcAWeDK5hkbGRZTeZNW42fwA%3D' (2025-12-05)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/5eda4ee8121f97b218f7cc73f5172098d458f1d1?narHash=sha256-ySNJ008muQAds2JemiyrWYbwbG%2BV7S5wg3ZVKGHSFu8%3D' (2025-09-24)
  → 'github:numtide/treefmt-nix/5b4ee75aeefd1e2d5a1cc43cf6ba65eba75e83e4?narHash=sha256-AlEObg0syDl%2BSpi4LsZIBrjw%2BsnSVU4T8MOeuZJUJjM%3D' (2025-11-12)

Author: github-actions[bot]