Resolve #3466924 "Drupal 10 compatibility"

Closes #3466924

src/Plugin/Block/PrimaryNavigation.php

@@ -24,7 +24,7 @@ class PrimaryNavigation extends BlockBase {
 
     $block = [
       '#type' => 'markup',
-      '#markup' => render($render_array),
+      '#markup' => \Drupal::service('renderer')->render($render_array),
     ];
     return $block;
   }