chore(example): Update flake.lock

Flake lock file updates:

• Updated input 'haskell-flake':
    'github:srid/haskell-flake/f66fe097c01b4ac20a28b4f26e760dffd5891967?narHash=sha256-NPxvw%2BFaxMPgwGGGiTbmNpfjFhR1HwPRWTBJJufWQ6Q%3D' (2025-03-09)
  → 'github:srid/haskell-flake/55a66589a74cfee4eb2bafa8937ef5656631cafb?narHash=sha256-XAlCptQcbRnVchIKw0x%2BRybjKJTkIqjOGURN98irF/A%3D' (2025-03-16)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/573c650e8a14b2faa0041645ab18aed7e60f0c9a?narHash=sha256-4thdbnP6dlbdq%2BqZWTsm4ffAwoS8Tiq1YResB%2BRP6WE%3D' (2025-03-13)
  → 'github:nixos/nixpkgs/94c4dbe77c0740ebba36c173672ca15a7926c993?narHash=sha256-GiQ40ndXRnmmbDZvuv762vS%2Bgew1uDpFwOfgJ8tLiEs%3D' (2025-03-21)

Author: github-actions[bot]