Update #vice-dev IRC network from freenode to Libera.Chat

git-svn-id: https://svn.code.sf.net/p/vice-emu/code/trunk@40072 379a1393-f5fb-40a0-bcee-ef074d9b53f7

Author: compyx

vice/doc/html/index.html

@@ -78,7 +78,7 @@ <h1><a NAME="news"></a>News</h1>
 is the usual call for volunteers... <tt>;-)</tt> If you like to join our
 group, and help us in any way , please send a mail to
 <a href="mailto:[email protected]">[email protected]</a>
-or catch us in #vice-dev on freenode IRC.
+or catch us in #vice-dev on Libera.Chat IRC.
 Anyone interested in helping development of VICE is welcome. Please contact
 <a href="mailto:[email protected]">us</a>
 to avoid doing something that someone else has done already. <tt>(-:</tt>