deps: update flake.lock (#136)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/32f313e49e42f715491e1ea7b306a87c16fe0388?narHash=sha256-nNaeJjo861wFR0tjHDyCnHs1rbRtrMgxAKMoig9Sj/w%3D' (2025-08-15)
  → 'github:nixos/nixpkgs/f937f8ecd1c70efd7e9f90ba13dfb400cf559de4?narHash=sha256-4/Jd%2BLkQ2ssw8luQVkqVs9spDBVE6h/u/hC/tzngsPo%3D' (2025-08-22)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/9c52372878df6911f9afc1e2a1391f55e4dfc864?narHash=sha256-c6yg0EQ9xVESx6HGDOCMcyRSjaTpNJP10ef%2B6fRcofA%3D' (2025-08-05)
  → 'github:cachix/pre-commit-hooks.nix/e891a93b193fcaf2fc8012d890dc7f0befe86ec2?narHash=sha256-RF7j6C1TmSTK9tYWO6CdEMtg6XZaUKcvZwOCD2SICZs%3D' (2025-08-23)

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

Author: mrcjkb