flake.lock: Update

Flake lock file updates:

• Updated input 'bscpkgs':
    'git+https://pm.bsc.es/gitlab/rarias/bscpkgs.git?ref=refs/heads/master&rev=18d64c352c10f9ce74aabddeba5a5db02b74ec27' (2023-08-31)
  → 'git+https://pm.bsc.es/gitlab/rarias/bscpkgs.git?ref=refs/heads/master&rev=ee24b910a1cb95bd222e253da43238e843816f2f' (2023-09-01)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/d680ded26da5cf104dd2735a51e88d2d8f487b4d' (2023-08-19)
  → 'github:NixOS/nixpkgs/e56990880811a451abd32515698c712788be5720' (2023-09-02)