The invitation link for the Slack community in README does not work. URL: https://gcp-slack.appspot.com/ <img width="792" alt="Screenshot 2023-06-17 at 18 25 23" src="https://github.com/googleapis/python-pubsub/assets/2691397/6ba9b4fa-569a-4ab6-a01a-2be7371c7810">
The invitation link for the Slack community in README does not work.
URL: https://gcp-slack.appspot.com/
