Regeneration failed

The post-submit [regeneration check](https://github.com/googleapis/google-cloud-python/actions/runs/32269196837) failed. Please investigate the failure. To keep the `main` branch healthy, please consider **reverting the triggering change** first. You can identify the cause from the workflow logs: - If the step 'Check for generated code changes' failed, there are pending code changes that need to be committed. - If the step 'Regenerate' failed, the generation script itself encountered an error.