deps: update flake.lock (#123)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/a4ff0e3c64846abea89662bfbacf037ef4b34207?narHash=sha256-UAaWOyQhdp7nXzsbmLVC67fo%2BQetzoTm9hsPf9X3yr4%3D' (2025-06-06)
  → 'github:nixos/nixpkgs/6afe187897bef7933475e6af374c893f4c84a293?narHash=sha256-K9yBph93OLTNw02Q6e9CYFGrUhvEXnh45vrZqIRWfvQ%3D' (2025-06-14)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/80479b6ec16fefd9c1db3ea13aeb038c60530f46?narHash=sha256-2Y53NGIX2vxfie1rOW0Qb86vjRZ7ngizoo%2BbnXU9D9k%3D' (2025-05-16)
  → 'github:cachix/pre-commit-hooks.nix/623c56286de5a3193aa38891a6991b28f9bab056?narHash=sha256-WUaIlOlPLyPgz9be7fqWJA5iG6rHcGRtLERSCfUDne4%3D' (2025-06-11)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: mrcjkb