docs: update slack invite to a perm link (#3036)

Author: chenrui333

CODE_OF_CONDUCT.md

@@ -55,7 +55,7 @@ further defined and clarified by project maintainers.
 ## Enforcement
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
-reported by contacting the project team by messaging `@lkysow` on the [Atlantis Slack channel](https://join.slack.com/t/atlantis-community/shared_invite/enQtNzc4NDM3OTA3ODI0LTA5NDQ4YTA3NTAxM2I3ZmIxMGNiYWJhNmY4YjBjZjM3OWMzNGI0NTcxNzY2NjRhODIyODA4YmNjOTBiOThhNTI). All
+reported by contacting the project team by messaging `@lkysow` on the [Atlantis Slack channel](https://join.slack.com/t/atlantis-community/shared_invite/zt-1nt7yx7uq-AnVRc_JItF1CDwZtfqv_OA). All
 complaints will be reviewed and investigated and will result in a response that
 is deemed necessary and appropriate to the circumstances. The project team is
 obligated to maintain confidentiality with regard to the reporter of an incident.