[form_handler] Update manifest.ini

form_handler/manifest.ini

 [info]
 name: Form Handler
 short_name: form_handler
-version: 1.2.2
+version: 1.2.3
 description: Lets the user display and answer forms attached to messages
 authors = Philipp Hoerist <philipp@hoerist.com>
 homepage: https://dev.gajim.org/gajim/gajim-plugins/wikis/formhandler