flake.lock: Update (#456)

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/f2f7418ce0ab4a5309a4596161d154cfc877af66?narHash=sha256-soePLBazJk0qQdDVhdbM98vYdssfs3WFedcq%2BraipRI%3D' (2025-01-01)
  → 'github:hercules-ci/flake-parts/b905f6fc23a9051a6e1b741e1438dbfc0634c6de?narHash=sha256-%2Bhu54pAoLDEZT9pjHlqL9DNzWz0NbUn8NEAHP7PQPzU%3D' (2025-01-06)
• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/75151f049969a87404442dbcf16e885875e29e72?narHash=sha256-hsJH%2Bqsn3hdE2Axo%2BMGQv2oVPzAXoBTdVJEhmUIprzo%3D' (2025-01-05)
  → 'github:nix-community/neovim-nightly-overlay/08f20528c23962643e6e522e7a207d5441699d36?narHash=sha256-rrAsRTWunnpLrij1L7qHbjfd152uY%2BXn8cZ2p%2BIG3oE%3D' (2025-01-06)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/a8ace2c58a318552869462a36859aabf1cdfaa68?narHash=sha256-ARpgwbA6wEHBFv4x6Cpv/sXHFkeBiZoYN0iBiI3fKQw%3D' (2025-01-04)
  → 'github:neovim/neovim/570a8da01b55c3aad1f057be236f55ccf82ed8af?narHash=sha256-ZgJKoADcfkMnEgJJh6ylOwnkR8V203xRvfezEHCtIrs%3D' (2025-01-05)
• Updated input 'neovim-nightly/treefmt-nix':
    'github:numtide/treefmt-nix/29806abab803e498df96d82dd6f34b32eb8dd2c8?narHash=sha256-1hKMRIT%2BQZNWX46e4gIovoQ7H8QRb7803ZH4qSKI45o%3D' (2025-01-03)
  → 'github:numtide/treefmt-nix/1788ca5acd4b542b923d4757d4cfe4183cc6a92d?narHash=sha256-FBG9d7e0BTFfxVdw4b5EmNll2Mv7hfRc54hbB4LrKko%3D' (2025-01-05)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/a27871180d30ebee8aa6b11bf7fef8a52f024733?narHash=sha256-Q4HuFAvoKAIiTRZTUxJ0ZXeTC7lLfC9/dggGHNXNlCw%3D' (2025-01-03)
  → 'github:nixos/nixpkgs/3df3c47c19dc90fec35359e89ffb52b34d2b0e94?narHash=sha256-30sOEZ8CFK2nTTMdkhaNrfVlIi3rWTNV0Z5z%2BNmpFNI%3D' (2025-01-06)

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