flake.lock: Update (#3940)

Flake lock file updates:

• Updated input 'flake-utils':
    'github:numtide/flake-utils/0f8662f1319ad6abf89b3380dd2722369fc51ade' (2022-03-26)
  → 'github:numtide/flake-utils/a4b154ebbdc88c8498a5c7b01589addc9e9cb678' (2022-04-11)
• Updated input 'naersk':
    'github:nix-community/naersk/d626f73332a8f587b613b0afe7293dd0777be07d' (2022-04-04)
  → 'github:nix-community/naersk/8cc379478819e6a22ce7595a761fe1e17c8d7458' (2022-04-16)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/42948b300670223ca8286aaf916bc381f66a5313' (2022-04-08)
  → 'github:NixOS/nixpkgs/75ad56bdc927f3a9f9e05e3c3614c4c1fcd99fcb' (2022-04-16)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/4579190c4c427b8350c662417c26254589dfe658' (2022-04-09)
  → 'github:oxalica/rust-overlay/d154de7dae2da8b52084ddbfe95ce6e5b0ba0a37' (2022-04-16)

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