flake.lock: Update

[github-actions]

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

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/970a59bd19eff3752ce552935687100c46e820a5' (2023-09-17)
  → 'github:NixOS/nixpkgs/8a86b98f0ba1c405358f1b71ff8b5e1d317f5db2' (2023-09-27)

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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