Update version.php

Author: TamaraGunkel

version.php

@@ -25,6 +25,8 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+$plugin->maturity = MATURITY_STABLE;
+$plugin->release   = 'v3.11-r4';
 $plugin->version   = 2021091201;        // The current plugin version (Date: YYYYMMDDXX).
 $plugin->requires  = 2015050500;        // Requires this Moodle version.
 $plugin->component = 'repository_opencast'; // Full name of the plugin (used for diagnostics).