Update slack links

learners/discuss.md

@@ -5,7 +5,7 @@ title: Discussion
 There are many ways to discuss Library Carpentry lessons:
 
 - Join our [Gitter discussion forum](https://gitter.im/LibraryCarpentry/).[Deprecated 2021]
-- Join our [Slack organisation](https://swc-slack-invite.herokuapp.com/) and #libraries channel.
+- Join our [Slack organisation](https://slack-invite.carpentries.org/) and #libraries channel.
 - Stay in touch with our [Topicbox Group](https://carpentries.topicbox.com/groups/discuss-library-carpentry).
 - Follow updates on [Twitter](https://twitter.com/LibCarpentry).
 - Make a suggestion or correct an error by [raising an issue](https://github.com/LibraryCarpentry/lc-open-refine/issues) or submitting a [pull request](https://github.com/LibraryCarpentry/lc-open-refine/pulls).