flake.lock: Update

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

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/dab3a6e781554f965bde3def0aa2fda4eb8f1708?narHash=sha256-lFNVsu/mHLq3q11MuGkMhUUoSXEdQjCHvpReaGP1S2k%3D' (2025-07-15)
  → 'github:NixOS/nixpkgs/fb5cf53218b987f2703a5bbc292a030c0fe33443?narHash=sha256-WoSazth5EXIJmveWf0zbTMycrgpbLYOth6KhmltMuv0%3D' (2025-10-08)

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