flake.lock: Update

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/47478a4a003e745402acf63be7f9a092d51b83d7' (2023-02-09)
  → 'github:hercules-ci/flake-parts/59cf3f1447cfc75087e7273b04b31e689a8599fb' (2023-08-01)
• Updated input 'flake-parts/nixpkgs-lib':
    'github:NixOS/nixpkgs/e1e1b192c1a5aab2960bf0a0bd53a2e8124fa18e?dir=lib' (2023-01-31)
  → 'github:NixOS/nixpkgs/9e1960bc196baf6881340d53dccb203a951745a2?dir=lib' (2023-08-01)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/ac1f5b72a9e95873d1de0233fddcb56f99884b37' (2023-02-16)
  → 'github:NixOS/nixpkgs/5a8e9243812ba528000995b294292d3b5e120947' (2023-08-07)