flake.lock: Update

Flake lock file updates:

• Updated input 'nix':
    'https://api.flakehub.com/f/pinned/DeterminateSystems/nix/2.25.3/01939864-5191-788c-b898-163d916a3333/source.tar.gz?narHash=sha256-rOFE8TSwWoup%2BLPNbmtTs6oLy7lYZ12L9GN%2BaZuQQaA%3D' (2024-12-03)
  → 'https://api.flakehub.com/f/pinned/DeterminateSystems/nix/2.25.4/019461e6-352f-72e8-8eed-6dcf3b8ea049/source.tar.gz?narHash=sha256-ccKmZxG1uoE1xjAvVGsWrOvhFDKB9h%2BuuzLFa7/EBF4%3D' (2025-01-13)
• Updated input 'nix/nix':
    'https://api.flakehub.com/f/pinned/NixOS/nix/2.25.3/01938786-bc70-79e3-b7ee-bb61f8e7f238/source.tar.gz?narHash=sha256-T%2BwFMm3cj8pGJSwXmPuxG5pz%2B1gRDJoToF9OBxtzocA%3D' (2024-11-29)
  → 'https://api.flakehub.com/f/pinned/NixOS/nix/2.25.4/01946096-6202-736c-ba97-f7c4e454ac80/source.tar.gz?narHash=sha256-cB/1vIYk8LWvL71hiKFu8froJHTUAfsYOOxBlBeNglI%3D' (2025-01-13)