flake.lock: Update

[github-actions]

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

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/db9208ab987cdeeedf78ad9b4cf3c55f5ebd269b' (2023-09-08)
  → 'github:NixOS/nixpkgs/ace5093e36ab1e95cb9463863491bee90d5a4183' (2023-09-15)

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

[github-actions]

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