flake.lock: Update (#187)

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)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]