Symfony 3.3.12 released

Symfony 3.3.12 has just been released. Here is a list of the most important changes: bug #24954 [DI] Fix dumping with custom base class (@nicolas-grekas) bug #24952 [HttpFoundation] Fix session-related BC break (@nicolas-grekas, @sroze) bug #24929 [Console] Fix traversable autocomplete values (@ro0NL) Want to upgrade to this new release? Fortunately, because Symfony protects backwards-compatibility very…