Add @todo for Package manager errors

phpstan.neon

@@ -46,6 +46,7 @@ parameters:
       reportUnmatched: false
 
     ### Package Manager
+    # @todo Remove after resolving https://www.drupal.org/i/3501836.
     # Caused by using self instead of static as a return type in \Drupal\fixture_manipulator\FixtureManipulator.
     -
       message: "#^Method Drupal\\\\fixture_manipulator\\\\FixtureManipulator\\:\\:commitChanges\\(\\) invoked with 0 parameters, 1 required\\.$#"