flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/c374d94f1536013ca8e92341b540eba4c22f9c62' (2024-08-21)
  → 'github:nixos/nixpkgs/574d1eac1c200690e27b8eb4e24887f8df7ac27c' (2024-09-06)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/6cedaa7c1b4f82a266e5d30f212273e60d62cb0d' (2024-08-21)
  → 'github:cachix/pre-commit-hooks.nix/7570de7b9b504cfe92025dd1be797bf546f66528' (2024-09-05)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/a18034322c7703fcfe5d7352a77981ba4a936a61' (2024-08-23)
  → 'github:oxalica/rust-overlay/8cc45e678e914a16c8e224c3237fb07cf21e5e54' (2024-09-07)