MDL-76390 tool_lp: Remove magic getter call

Since Moodle 3.3 (see MDL-57273), the magix getters and setters
for persistent classes are deprecated, instead get() and set()
must be used.

admin/tool/lp/classes/external.php

@@ -278,7 +278,7 @@ public static function data_for_competency_summary($competencyid, $includerelate
         ));
 
         $competency = api::read_competency($params['competencyid']);
-        $framework = api::read_framework($competency->get_competencyframeworkid());
+        $framework = api::read_framework($competency->get('competencyframeworkid'));
         self::validate_context($framework->get_context());
         $renderable = new output\competency_summary($competency, $framework, $params['includerelated'], $params['includecourses']);
         $renderer = $PAGE->get_renderer('tool_lp');