Bump dev version ahead of master.

stack/maxima/stackmaxima.mac

@@ -3299,4 +3299,4 @@ is_lang(code):=ev(is(%_STACK_LANG=code),simp=true)$
 
 /* Stack expects some output with the version number the output happens at */
 /* maximalocal.mac after additional library loading */
-stackmaximaversion:2022060200$
+stackmaximaversion:2022060300$

version.php

@@ -24,7 +24,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version   = 2022060200;
+$plugin->version   = 2022060300;
 $plugin->requires  = 2020061500;
 $plugin->cron      = 0;
 $plugin->component = 'qtype_stack';