flake.lock: Update

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/c621e8422220273271f52058f618c94e405bb0f5' (2025-04-01)
  → 'github:hercules-ci/flake-parts/9305fe4e5c2a6fcf5ba6a3ff155720fbe4076569' (2025-06-08)
• Updated input 'flake-parts/nixpkgs-lib':
    'github:nix-community/nixpkgs.lib/e4822aea2a6d1cdd36653c134cacfd64c97ff4fa' (2025-03-30)
  → 'github:nix-community/nixpkgs.lib/656a64127e9d791a334452c6b6606d17539476e2' (2025-06-01)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/fe51d34885f7b5e3e7b59572796e1bcb427eccb1' (2025-05-22)
  → 'github:NixOS/nixpkgs/076e8c6678d8c54204abcb4b1b14c366835a58bb' (2025-06-20)

Author: github-actions[bot]