flake.lock: Update

[nix-eval-jobs-bot]

Automated changes by the update-flake-lock GitHub Action.

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/f53ec4f6d815f80f7ee6a490a946b1b2b4f9cb09' (2023-09-04)
  → 'github:NixOS/nixpkgs/308e5f73e17dc2fe43ba95ec83697999b5dd544d' (2023-09-07)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/e3e0f9f6d47f8fc68aff15150eda1224fb46f4d4' (2023-09-02)
  → 'github:numtide/treefmt-nix/b8d3a059f5487d6767d07c3716386753e3132d9f' (2023-09-04)

Running GitHub Actions on this PR

GitHub Actions will not run workflows on pull requests which are opened by a GitHub Action.

To run GitHub Actions workflows on this PR, run:

git branch -D update_flake_lock_action
git fetch origin
git checkout update_flake_lock_action
git commit --amend --no-edit
git push origin update_flake_lock_action --force