Replace freenode with libera IRC server (#34050)

Author: midzer

site/content/docs/5.0/getting-started/introduction.md

@@ -154,7 +154,7 @@ Stay up to date on the development of Bootstrap and reach out to the community w
 
 - Read and subscribe to [The Official Bootstrap Blog]({{< param blog >}}).
 - Join [the official Slack room]({{< param slack >}}).
-- Chat with fellow Bootstrappers in IRC. On the `irc.freenode.net` server, in the `##bootstrap` channel.
+- Chat with fellow Bootstrappers in IRC. On the `irc.libera.chat` server, in the `#bootstrap` channel.
 - Implementation help may be found at Stack Overflow (tagged [`bootstrap-5`](https://stackoverflow.com/questions/tagged/bootstrap-5)).
 - Developers should use the keyword `bootstrap` on packages that modify or add to the functionality of Bootstrap when distributing through [npm](https://www.npmjs.com/search?q=keywords:bootstrap) or similar delivery mechanisms for maximum discoverability.