update link to join the Slack channel

Author: wing328

docs/faq.md

@@ -5,7 +5,7 @@ title: "FAQ: General"
 
 ## Do you have a chat room?
 
-[![Join the Slack chat room](https://img.shields.io/badge/Slack-Join%20the%20chat%20room-orange)](https://join.slack.com/t/openapi-generator/shared_invite/zt-12jxxd7p2-XUeQM~4pzsU9x~eGLQqX2g)
+[![Join the Slack chat room](https://img.shields.io/badge/Slack-Join%20the%20chat%20room-orange)](https://join.slack.com/t/openapi-generator/shared_invite/zt-2uoef5v0g-XGwo8~2oJ3EoziDSO1CmdQ)
 
 ## What is the governance structure of the OpenAPI Generator project?