flake.lock: Update

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/9126214d0a59633752a136528f5f3b9aa8565b7d' (2024-04-01)
  → 'github:hercules-ci/flake-parts/2a55567fcf15b1b1c7ed712a2c6fadaec7412ea8' (2024-06-01)
• Updated input 'flake-parts/nixpkgs-lib':
    'github:NixOS/nixpkgs/d8fe5e6c92d0d190646fb9f1056741a229980089?dir=lib' (2024-03-29)
  → 'https://github.com/NixOS/nixpkgs/archive/eb9ceca17df2ea50a250b6b27f7bf6ab0186f198.tar.gz?narHash=sha256-lIbdfCsf8LMFloheeE6N31%2BBMIeixqyQWbSr2vk79EQ%3D' (2024-06-01)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/1042fd8b148a9105f3c0aca3a6177fd1d9360ba5' (2024-04-10)
  → 'github:nixos/nixpkgs/d603719ec6e294f034936c0d0dc06f689d91b6c3' (2024-06-20)