flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/7e52b35fe98481a279d89f9c145f8076d049d2b9' (2022-09-27)
  → 'github:NixOS/nixpkgs/4428e23312933a196724da2df7ab78eb5e67a88e' (2022-10-14)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/60cad1a326df17a8c6cf2bb23436609fdd83024e' (2022-09-13)
  → 'github:cachix/pre-commit-hooks.nix/94b0f300dd9a23d4e851aa2a947a1511d3410e2d' (2022-10-12)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/1601b5a28c50fd9d40bd61b8878f3499e09bce7a' (2022-09-29)
  → 'github:oxalica/rust-overlay/f55e3d741c6fe357d1e1bea50f5916863c831fdc' (2022-10-15)