feat: update flake.lock: Update (#88)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/08f22084e6085d19bcfb4be30d1ca76ecb96fe54?narHash=sha256-XE/lFNhz5lsriMm/yjXkvSZz5DfvKJLUjsS6pP8EC50%3D' (2025-06-19)
  → 'github:nixos/nixpkgs/30e2e2857ba47844aa71991daa6ed1fc678bcbb7?narHash=sha256-krGXKxvkBhnrSC/kGBmg5MyupUUT5R6IBCLEzx9jhMM%3D' (2025-06-27)

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Author: github-actions[bot]