Upgrade to ejabberd 26.02

If you upgrade ejabberd from a previous release to 26.02, there are no changes in SQL schemas, configuration, API commands or hooks.

Notice that mod_muc now incorporates the feature from mod_muc_occupantid, and that module has been removed. You can remove mod_muc_occupantid in your configuration file as it is unnecessary now, and ejabberd simply ignores it.