Minor: Format code and fix save cache item

public/main/gradebook/lib/be/exerciselink.class.php

@@ -295,7 +295,9 @@ class ExerciseLink extends AbstractLink
                 return $result;
             } else {
                 if ($cacheAvailable) {
-                    $cacheDriver->save($key, null);
+                    $cacheItem = $cache->getItem($key);
+                    $cacheItem->set(null);
+                    $cache->save($cacheItem);
                 }
 
                 return null;

src/CoreBundle/Controller/CourseController.php

@@ -49,8 +49,9 @@ use UserManager;
 #[Route('/course')]
 class CourseController extends ToolBaseController
 {
-    public function __construct(private SerializerInterface $serializer)
-    {
+    public function __construct(
+        private SerializerInterface $serializer
+    ) {
     }
 
     #[Route('/{cid}/checkLegal.json', name: 'chamilo_core_course_check_legal_json')]