flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'https://api.flakehub.com/f/pinned/nixos/nixpkgs/0.1.945868%2Brev-a82ccc39b39b621151d6732718e3e250109076fa/019c5b2e-592f-7d17-b9ce-868f25acfeca/source.tar.gz' (2026-02-13)
  → 'https://api.flakehub.com/f/pinned/nixos/nixpkgs/0.1.948083%2Brev-0182a361324364ae3f436a63005877674cf45efb/019c71f3-061e-7c0e-b75b-ea375738503a/source.tar.gz' (2026-02-17)

Author: github-actions[bot]