flake.lock: Update (#4080)

Flake lock file updates:

• Updated input 'naersk':
    'github:nix-community/naersk/c6a45e4277fa58abd524681466d3450f896dc094' (2022-08-04)
  → 'github:nix-community/naersk/6944160c19cb591eb85bbf9b2f2768a935623ed3' (2022-09-03)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/f3d0897be466aa09a37f6bf59e62c360c3f9a6cc' (2022-08-25)
  → 'github:NixOS/nixpkgs/2da64a81275b68fdad38af669afeda43d401e94b' (2022-09-01)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/790c16639c7d8da8b36d0aa6a7c1f589af8c5f68' (2022-08-27)
  → 'github:oxalica/rust-overlay/8ac6d40380dc4ec86f1ff591d5c14c8ae1d77a18' (2022-09-03)

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