flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/c315728360f819546180871e608f8a4ac1967914?narHash=sha256-FsKxMY0ZW27wKndFytVQPnrtsaD4jrRKIkjpZ54u9Wc%3D' (2024-04-01)
  → 'github:NixOS/nixpkgs/a534c335e0159807d67e217c4ad695dd9e6544fc?narHash=sha256-%2B61DS5%2BPr37rBIChAM56q/hlOC0kvsJGLHkWQDhh6zk%3D' (2024-05-01)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/f3bb95498eaaa49a93bacaf196cdb6cf8e872cdf?narHash=sha256-pnbHEXJOdGkPrHBdkZLv/a2V09On%2BV3J4aPE/BfAJC8%3D' (2024-04-01)
  → 'github:cachix/pre-commit-hooks.nix/2849da033884f54822af194400f8dff435ada242?narHash=sha256-q//cgb52vv81uOuwz1LaXElp3XAe1TqrABXODAEF6Sk%3D' (2024-04-30)