chore(example): Update flake.lock

Flake lock file updates:

• Updated input 'haskell-flake':
    'github:srid/haskell-flake/b13eb3f9b8f4666e2d7c9641d1f914e45afe575c?narHash=sha256-cJa3mhmWLj1%2BDLmb3Bkq%2B5cCkeBAsbTkSKf0XvlMo9w%3D' (2024-12-08)
  → 'github:srid/haskell-flake/72a4c403230c4b8bcfa5571c3b7e76253fc8d966?narHash=sha256-QQbB7e9DQwKCjuLIMQjd9KTpeyvssK9muNAS7hR98y0%3D' (2024-12-20)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/5a48e3c2e435e95103d56590188cfed7b70e108c?narHash=sha256-xyiHLs6KJ1fxeGmcCxKjJE4yJknVJxbC8Y/ZRYyC8WE%3D' (2024-12-11)
  → 'github:nixos/nixpkgs/4989a246d7a390a859852baddb1013f825435cee?narHash=sha256-kMBQ5PRiFLagltK0sH%2B08aiNt3zGERC2297iB6vrvlU%3D' (2024-12-17)

Author: github-actions[bot]