flake.lock: Update (#1119)

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)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/f44db7d7cea4528288780c6347756173a8248225?narHash=sha256-veyXchTz6eWwvuW5X49UluHkheHkFcqHJSwGuKBhrmQ%3D' (2025-05-17)
  → 'github:oxalica/rust-overlay/2221d8d53c128beb69346fa3ab36da3f19bb1691?narHash=sha256-rwFiLLNCwkj9bqePtH1sMqzs1xmohE0Ojq249piMzF4%3D' (2025-05-24)

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