flake: update lockfile

[github-actions[bot]]

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

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/2ffe299fe468517bf8e6e62822f806c0e2ab368b' (2023-09-08)
  → 'github:NixOS/nixpkgs/c08b005e0f6ce26d0269e9ac7e12747a29f822fb' (2023-09-08)

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

[soopyc]

updated in 2610dd4