Moodle 4.5 deprecated print_error, use moodle_exception

- Final deprecation of `\print_error()`. Please use the `\moodle_exception` class instead.
  For more information see [MDL-74484](https://tracker.moodle.org/browse/MDL-74484)

Author: ScottVerbeek

autologin.php

@@ -31,4 +31,4 @@
 \auth_saml2\auto_login::finish((bool)$success, new moodle_url($url));
 
 // Something strange went wrong, or somebody tried to directly link here.
-print_error('errorinvalidautologin', 'auth_saml2');
+throw new \moodle_exception('errorinvalidautologin', 'auth_saml2');