Bump version number ahead of master.

stack/maxima/stackmaxima.mac

@@ -3439,4 +3439,4 @@ 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:2023010400$
+stackmaximaversion:2023010401$

version.php

@@ -24,11 +24,11 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version   = 2023010400;
+$plugin->version   = 2023010401;
 $plugin->requires  = 2020061500;
 $plugin->cron      = 0;
 $plugin->component = 'qtype_stack';
-$plugin->maturity  = MATURITY_STABLE;
+$plugin->maturity  = MATURITY_ALPHA;
 $plugin->release   = '4.4.2 for Moodle 3.9+';
 
 $plugin->dependencies = array(