flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.733374%2Brev-8f3e1f807051e32d8c95cd12b9b421623850a34d/01943a5d-98a8-75c0-9963-3a93900583fd/source.tar.gz?narHash=sha256-/qlNWm/IEVVH7GfgAIyP6EsVZI6zjAx1cV5zNyrs%2BrI%3D' (2025-01-04)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.769969%2Brev-b6eaf97c6960d97350c584de1b6dcff03c9daf42/0195ac6b-d144-7921-8edb-0621451882dd/source.tar.gz?narHash=sha256-Txwa5uO%2BqpQXrNG4eumPSD%2BhHzzYi/CdaM80M9XRLCo%3D' (2025-03-18)

Author: cole-h