Bump the version number ahead of master.

stack/maxima/stackmaxima.mac

@@ -3288,4 +3288,4 @@ 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:2023060500$
+stackmaximaversion:2023060600$

version.php

@@ -24,12 +24,12 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version   = 2023060500;
+$plugin->version   = 2023060600;
 $plugin->requires  = 2020061500;
 $plugin->cron      = 0;
 $plugin->component = 'qtype_stack';
-$plugin->maturity  = MATURITY_STABLE;
-$plugin->release   = '4.4.4 for Moodle 3.9+';
+$plugin->maturity  = MATURITY_ALPHA;
+$plugin->release   = '4.4.5 for Moodle 3.9+';
 
 $plugin->dependencies = array(
     'qbehaviour_adaptivemultipart'     => 2020103000,