feat: update flake.lock (#100)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/c23193b943c6c689d70ee98ce3128239ed9e32d1?narHash=sha256-hLEO2TPj55KcUFUU1vgtHE9UEIOjRcH/4QbmfHNF820%3D' (2025-09-13)
  → 'github:nixos/nixpkgs/8eaee110344796db060382e15d3af0a9fc396e0e?narHash=sha256-iCGWf/LTy%2BaY0zFu8q12lK8KuZp7yvdhStehhyX1v8w%3D' (2025-09-19)

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Author: github-actions[bot]