flake.lock: Update

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/8471fe90ad337a8074e957b69ca4d0089218391d?narHash=sha256-XOQkdLafnb/p9ij77byFQjDf5m5QYl9b2REiVClC%2Bx4%3D' (2024-08-01)
  → 'github:hercules-ci/flake-parts/567b938d64d4b4112ee253b9274472dc3a346eb6?narHash=sha256-%2Bebgonl3NbiKD2UD0x4BszCZQ6sTfL4xioaM49o5B3Y%3D' (2024-09-01)
• Updated input 'nixpkgs':
    'github:Nixos/nixpkgs/215ea7473ff80eb6cb157ee07223920cc53f4b09?narHash=sha256-dGHUOi1tBiVOsVdT9QNEuk%2BFuSMtQxkyx%2B9CN/34kkk%3D' (2024-08-28)
  → 'github:Nixos/nixpkgs/9b40840066f93767bb528810ea7dc9caacd8997f?narHash=sha256-YWbVeDERbIHAEQCtDtUunHYUNH31ReIdJIP8juXfdpM%3D' (2024-09-04)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/3ffd842a5f50f435d3e603312eefa4790db46af5?narHash=sha256-F4djBvyNRAXGusJiNYInqR6zIMI3rvlp6WiKwsRISos%3D' (2024-08-28)
  → 'github:numtide/treefmt-nix/9fb342d14b69aefdf46187f6bb80a4a0d97007cd?narHash=sha256-VcqxWT0O/gMaeWTTjf1r4MOyG49NaNxW4GHTO3xuThE%3D' (2024-09-02)