flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/7e52b35fe98481a279d89f9c145f8076d049d2b9' (2022-09-27)
  → 'github:NixOS/nixpkgs/598f83ebeb2235435189cf84d844b8b73e858e0f' (2022-10-06)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/60cad1a326df17a8c6cf2bb23436609fdd83024e' (2022-09-13)
  → 'github:cachix/pre-commit-hooks.nix/2e4a708918e14fdbd534cc94aaa9470cd19b2464' (2022-10-02)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/1601b5a28c50fd9d40bd61b8878f3499e09bce7a' (2022-09-29)
  → 'github:oxalica/rust-overlay/ad99d2a83db05d1c5caae4ac96f0515ba6f2b6df' (2022-10-08)

Author: github-actions[bot]