Update flake.lock

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

Flake lock file updates:

• Updated input 'nixpkgs':
    'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2505.809873%2Brev-9a094440e02a699be5c57453a092a8baf569bdad/019948d8-e1ce-71d3-a6ab-b8e7de3004e2/source.tar.gz?narHash=sha256-Vp9K5ol6h0J90jG7Rm4RWZsCB3x7v5VPx588TQ1dkfs%3D' (2025-09-14)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2505.810541%2Brev-5ed4e25ab58fd4c028b59d5611e14ea64de51d23/019998db-c700-7a88-bb8a-a6a592d79b5d/source.tar.gz?narHash=sha256-TvODmeR2W7yX/JmOCmP%2BlAFNkTT7hAxYcF3Kz8SZV3w%3D' (2025-09-29)

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