feat: update flake.lock (#83)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/e06158e58f3adee28b139e9c2bcfcc41f8625b46?narHash=sha256-LSmTbiq/nqZR9B2t4MRnWG7cb0KVNU70dB7RT4%2BwYK4%3D' (2025-05-15)
  → 'github:nixos/nixpkgs/063f43f2dbdef86376cc29ad646c45c46e93234c?narHash=sha256-6m1Y3/4pVw1RWTsrkAK2VMYSzG4MMIj7sqUy7o8th1o%3D' (2025-05-23)

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Author: github-actions[bot]