chore(example): Update flake.lock

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/77826244401ea9de6e3bac47c2db46005e1f30b5?narHash=sha256-Tyw1RjYEsp5scoigs1384gIg6e0GoBVjms4aXFfRssQ%3D' (2025-07-01)
  → 'github:hercules-ci/flake-parts/644e0fc48951a860279da645ba77fe4a6e814c5e?narHash=sha256-TVcTNvOeWWk1DXljFxVRp%2BE0tzG1LhrVjOGGoMHuXio%3D' (2025-07-21)
• Updated input 'haskell-flake':
    'github:srid/haskell-flake/39065472d2587af93a502423276bfb98c2c6fb09?narHash=sha256-Yif99ho8GNgXP0l9vxPHCKi7X16Cf7rwVd%2BHW1cMVeQ%3D' (2025-07-14)
  → 'github:srid/haskell-flake/72a74b6ac9cda796e43d39643e818be94f35047f?narHash=sha256-StyB4UPW3lDXSlzwbMGl4Sd3n%2BGc%2BkkAKfzniF0JGaU%3D' (2025-07-20)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/6b4955211758ba47fac850c040a27f23b9b4008f?narHash=sha256-dPALCtmik9Wr14MGqVXm%2BOQcv7vhPBXcWNIOThGnB/Q%3D' (2025-07-19)
  → 'github:nixos/nixpkgs/6027c30c8e9810896b92429f0092f624f7b1aace?narHash=sha256-cnL5WWn/xkZoyH/03NNUS7QgW5vI7D1i74g48qplCvg%3D' (2025-07-25)

Author: github-actions[bot]