flake.lock: Update

[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/0.1.958232%2Brev-80bdc1e5ce51f56b19791b52b2901187931f5353/019cbcff-0413-7b59-87be-b2cea58a4043/source.tar.gz' (2026-03-04)
  → 'https://api.flakehub.com/f/pinned/nixos/nixpkgs/0.1.962836%2Brev-c06b4ae3d6599a672a6210b7021d699c351eebda/019cec4e-dd38-75a8-9d2d-0d91492115c9/source.tar.gz' (2026-03-13)

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