example: Update flake.lock

Flake lock file updates:

• Updated input 'haskell-flake':
    'github:srid/haskell-flake/92e393141a123c9695bc15dbe1ca0a1b7fef142b?narHash=sha256-AGkk2WK/E9mLcoEdfegZ1aYNh6HtOdPuEx4O%2Br44u3I%3D' (2024-04-11)
  → 'github:srid/haskell-flake/53e434d194f08c5ef9b2ba448b250f0321e6d529?narHash=sha256-TDnvGInwe24zqhUVmQOLt3EkfP9vVpWIwfScJPopTg0%3D' (2024-04-20)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/a0c9e3aee1000ac2bfb0e5b98c94c946a5d180a9?narHash=sha256-icE1IJE9fHcbDfJ0%2BqWoDdcBXUoZCcIJxME4lMHwvSM%3D' (2024-04-12)
  → 'github:nixos/nixpkgs/fd16bb6d3bcca96039b11aa52038fafeb6e4f4be?narHash=sha256-LJbHQQ5aX1LVth2ST%2BKkse/DRzgxlVhTL1rxthvyhZc%3D' (2024-04-20)