flake.lock: Update (#312)

Automated changes by the
[update-flake-lock](https://github.com/DeterminateSystems/update-flake-lock)
GitHub Action.

```
Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/06cf0e1da4208d3766d898b7fdab6513366d45b9?narHash=sha256-S5kVU7U82LfpEukbn/ihcyNt2%2BEvG7Z5unsKW9H/yFA%3D' (2024-09-29)
  → 'github:nixos/nixpkgs/27e30d177e57d912d614c88c622dcfdb2e6e6515?narHash=sha256-HP89HZOT0ReIbI7IJZJQoJgxvB2Tn28V6XS3MNKnfLs%3D' (2024-10-01)
```

### Running GitHub Actions on this PR

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To run GitHub Actions workflows on this PR, run:

```sh
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
```

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