flake.lock: Update (#1012)

Flake lock file updates:

• Updated input 'nixos-infra':
    'github:NixOS/infra/678aeb5371241bd901066831f98f80e33e455f5b?narHash=sha256-hoVVolx/JJl5pbg405NwAuT99CMH4bh6dtcfzk7Khro%3D' (2025-09-13)
  → 'github:NixOS/infra/b0189726e90ccc93611b16e0f43e5d3eff6c2e03?narHash=sha256-4wqvi3tQd3LA7u4Odzrfp6u34g8JtEu7IZc3vdISU6U%3D' (2025-09-18)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/ab0f3607a6c7486ea22229b92ed2d355f1482ee0?narHash=sha256-zwE/e7CuPJUWKdvvTCB7iunV4E/%2BG0lKfv4kk/5Izdg%3D' (2025-09-10)
  → 'github:NixOS/nixpkgs/8eaee110344796db060382e15d3af0a9fc396e0e?narHash=sha256-iCGWf/LTy%2BaY0zFu8q12lK8KuZp7yvdhStehhyX1v8w%3D' (2025-09-19)
• Updated input 'npmlock2nix':
    'github:nix-community/npmlock2nix/9197bbf397d76059a76310523d45df10d2e4ca81?narHash=sha256-sJM82Sj8yfQYs9axEmGZ9Evzdv/kDcI9sddqJ45frrU%3D' (2023-01-11)
  → 'github:nix-community/npmlock2nix/4d9060afbaa5f57ee0b8ef11c7044ed287a7d302?narHash=sha256-qJc3ffjHVXUdZqytKcDK9XZ2b3BQ1RdYfZFuYgxbrn4%3D' (2025-09-17)

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

Author: github-actions[bot]