Merge branch '6.4' into 7.0

* 6.4:
  fix merge
  [AssetMapper] Split test dirs in tests
  Fix typo
  Change incorrect check for the `stateless` request attribute
  use copy() instead of rename() on Windows
  test: kebab-case to snake_case
  [PropertyInfo] Handle collection in PhpStan same as PhpDoc
  [Messenger] Passing to `WorkerMessageRetriedEvent` envelope with actual stamps after sent

Author: xabbuh

Tests/AbstractAsciiTestCase.php

@@ -1068,6 +1068,8 @@ public static function provideSnake()
             ['x_y', 'x_y'],
             ['x_y', 'X_Y'],
             ['xu_yo', 'xu_yo'],
+            ['symfony_is_great', 'symfony-is-great'],
+            ['symfony_is_great', 'symfony.is.great'],
             ['symfony_is_great', 'symfonyIsGreat'],
             ['symfony5_is_great', 'symfony5IsGreat'],
             ['symfony5is_great', 'symfony5isGreat'],