Fix a small bug: - [Error: Call to undefined method Drupal\Core\Http\RequestStack::getSchemeAndHttpHost()](https://www.drupal.org/project/send_emails/issues/3365013)
Fix a small bug: - [Error: Call to undefined method Drupal\Core\Http\RequestStack::getSchemeAndHttpHost()](https://www.drupal.org/project/send_emails/issues/3365013)