Merge branch '6.4' into 7.3

* 6.4:
  Remove legacy twig.exception_controller option

Author: xabbuh

config/packages/twig.yaml

@@ -2,4 +2,3 @@ twig:
     default_path: '%kernel.project_dir%/templates'
     debug: '%kernel.debug%'
     strict_variables: '%kernel.debug%'
-    exception_controller: null