Update root Nix flake inputs

[github-actions]

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

Flake lock file updates:

• Updated input 'nixpkgs':
    'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.876718%2Brev-cf3f5c4def3c7b5f1fc012b3d839575dbe552d43/0199de8d-d5c2-77df-9350-8f2ad375caae/source.tar.gz?narHash=sha256-TK9Kr0BYBQ/1P5kAsnNQhmWWKgmZXwUQr4ZMjCzWf2c%3D' (2025-10-12)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.886100%2Brev-08dacfca559e1d7da38f3cf05f1f45ee9bfd213c/019a329e-32b1-7e68-9599-4784bdd5f623/source.tar.gz?narHash=sha256-o9KF3DJL7g7iYMZq9SWgfS1BFlNbsm6xplRjVlOCkXI%3D' (2025-10-28)

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