flake.lock: Update (#4096)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/74a1793c659d09d7cf738005308b1f86c90cb59b' (2022-09-09)
  → 'github:NixOS/nixpkgs/da6a05816e7fa5226c3f61e285ef8d9dfc868f3c' (2022-09-16)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/8cb8ea5f1c7bc2984f460587fddd5f2e558f6eb8' (2022-08-18)
  → 'github:cachix/pre-commit-hooks.nix/60cad1a326df17a8c6cf2bb23436609fdd83024e' (2022-09-13)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/70d8df25fbe9cc5c74900b11d06ef120200f3948' (2022-09-10)
  → 'github:oxalica/rust-overlay/e4c6adaa5f9293911de5ad50eaf32dbe36819de3' (2022-09-17)

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