flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/9af9c1c87ed3e3ed271934cb896e0cdd33dae212' (2024-03-15)
  → 'github:nixos/nixpkgs/20bc93ca7b2158ebc99b8cef987a2173a81cde35' (2024-03-23)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/5df5a70ad7575f6601d91f0efec95dd9bc619431' (2024-02-15)
  → 'github:cachix/pre-commit-hooks.nix/e611897ddfdde3ed3eaac4758635d7177ff78673' (2024-03-20)
• Updated input 'pre-commit-hooks/flake-utils':
    'github:numtide/flake-utils/4022d587cbbfd70fe950c1e2083a02621806a725' (2023-12-04)
  → 'github:numtide/flake-utils/b1d9ab70662946ef0850d488da1c9019f3a9752a' (2024-03-11)
• Updated input 'pre-commit-hooks/gitignore':
    'github:hercules-ci/gitignore.nix/43e1aa1308018f37118e34d3a9cb4f5e75dc11d5' (2023-12-29)
  → 'github:hercules-ci/gitignore.nix/637db329424fd7e46cf4185293b9cc8c88c95394' (2024-02-28)
• Updated input 'pre-commit-hooks/nixpkgs-stable':
    'github:NixOS/nixpkgs/3dc440faeee9e889fe2d1b4d25ad0f430d449356' (2024-01-10)
  → 'github:NixOS/nixpkgs/614b4613980a522ba49f0d194531beddbb7220d3' (2024-03-17)