Update slack links

[froggleston]

The Carpentries recently updated their Slack domain URL and invite app URL. This PR updates the links to match the new domains.

[github-actions[bot]]

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:mag: Inspect the changes: https://github.com/datacarpentry/python-socialsci/compare/md-outputs..md-outputs-PR-191

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:stopwatch: Updated at 2023-08-29 13:20:50 +0000