Deprecated file_system_settings_submit() calls settingsSubmit() on wrong class

Woops :D confirmed that this is valid - another reason to try and get our phpstan levels higher.

Committed/pushed to 11.x, thanks!

catch → closed merge request !12929

Would be good to have an alternative to \Drupal::service() that takes a class name so we can do this:

/**
 * @template T of object
 * @param class-string<T> $className
 * @return T
 */
function createInstance(string $className): object {}

...and have phpstan do the validation.

Automatically closed - issue fixed for 2 weeks with no activity.