flake.lock: Update

Flake lock file updates:

• Updated input 'disko':
    'github:nix-community/disko/ba53a0433d1694b96c63ea67db0f3e1292bb2b01' (2023-04-16)
  → 'github:nix-community/disko/a433c7995448989e697c9f913405df1a98122885' (2023-04-20)
• Updated input 'hercules-ci-effects':
    'github:hercules-ci/hercules-ci-effects/6c1ee352e9c65302969fc510828a98bea38500f6' (2023-03-29)
  → 'github:hercules-ci/hercules-ci-effects/15ff4f63e5f28070391a5b09a82f6d5c6cc5c9d0' (2023-04-19)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/b9e9372e6be61a91f0b13fd5eb88b34ccd6d16ff' (2023-04-16)
  → 'github:NixOS/nixpkgs/543700e8140313dd59c5473e4b1156e8fc003011' (2023-04-20)
• Updated input 'sops-nix':
    'github:Mic92/sops-nix/b7a6670a28b01cd1f62879921e36be2c69c4137a' (2023-04-16)
  → 'github:Mic92/sops-nix/5698b06b0731a2c15ff8c2351644427f8ad33993' (2023-04-18)
• Updated input 'srvos':
    'github:numtide/srvos/8fba52ed4d386bb00838a9ca8caadf1aff499077' (2023-04-17)
  → 'github:numtide/srvos/de1e50a7691015bacca2852688049eee67f711f3' (2023-04-20)