chaneg back to support 3.9+

Author: NinaHerrmann

version.php

@@ -28,7 +28,7 @@
 $plugin->component = 'repository_opencast';
 $plugin->release = 'v4.3-r1';
 $plugin->version = 2023112200;
-$plugin->requires = 2022112800; // Requires Moodle 4.1+.
+$plugin->requires = 2020061524; // Requires Moodle 3.9+.
 $plugin->maturity = MATURITY_STABLE;
 $plugin->dependencies = [
     'tool_opencast' => 2023112200,