flake.lock: Update

[github-actions[bot]]

Automated changes by the update-flake-lock GitHub Action.

Flake lock file updates:

• Updated input 'nixpkgs':
    'git+https://github.com/NixOS/nixpkgs?ref=nixpkgs-unstable&rev=ebe4301cbd8f81c4f8d3244b3632338bbeb6d49c&shallow=1' (2025-04-17)
  → 'git+https://github.com/NixOS/nixpkgs?ref=nixpkgs-unstable&rev=fe51d34885f7b5e3e7b59572796e1bcb427eccb1&shallow=1' (2025-05-22)

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