chore(example): Update flake.lock

Flake lock file updates:

• Updated input 'haskell-flake':
    'github:srid/haskell-flake/a1506861ce09cca2d233d014fd03dd97ed03e3b9?narHash=sha256-U1vZkKOy7bB/qMRwS8cz4c8sy68Jq8yzRMV4G40U3Us%3D' (2024-07-07)
  → 'github:srid/haskell-flake/cd449f1c04175efdf5b553302d22916640090066?narHash=sha256-k9kwz2lpUqafRUpuCMgkv4AWtHEoJPCds1ZPRkyW2XE%3D' (2024-07-14)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/8b5a3d5a1d951344d683b442c0739010b80039db?narHash=sha256-po3TZO9kcZwzvkyMJKb0WCzzDtiHWD34XeRaX1lWXp0%3D' (2024-07-12)
  → 'github:nixos/nixpkgs/6e14bbce7bea6c4efd7adfa88a40dac750d80100?narHash=sha256-pFSxgSZqZ3h%2B5Du0KvEL1ccDZBwu4zvOil1zzrPNb3c%3D' (2024-07-20)

Author: github-actions[bot]