chore(example): Update flake.lock

Flake lock file updates:

• Updated input 'haskell-flake':
    'github:srid/haskell-flake/64bd0f328e5a424b65aafdde3901b64f4f390b0f?narHash=sha256-MtatlRdAy7eWdgZI8JgW/OmY/aqF%2BSvRucqlsLHzX80%3D' (2024-07-03)
  → 'github:srid/haskell-flake/a1506861ce09cca2d233d014fd03dd97ed03e3b9?narHash=sha256-U1vZkKOy7bB/qMRwS8cz4c8sy68Jq8yzRMV4G40U3Us%3D' (2024-07-07)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/4284c2b73c8bce4b46a6adf23e16d9e2ec8da4bb?narHash=sha256-i4vJL12/AdyuQuviMMd1Hk2tsGt02hDNhA0Zj1m16N8%3D' (2024-07-05)
  → 'github:nixos/nixpkgs/8b5a3d5a1d951344d683b442c0739010b80039db?narHash=sha256-po3TZO9kcZwzvkyMJKb0WCzzDtiHWD34XeRaX1lWXp0%3D' (2024-07-12)

Author: github-actions[bot]