Merge branch '6.4' into 7.0

* 6.4:
  Fix test

Author: xabbuh

src/Symfony/Component/PropertyAccess/Tests/Fixtures/TestClassMagicGet.php

@@ -40,7 +40,7 @@ public function __get(string $property)
         }
     }
 
-    public function __isset(string $property)
+    public function __isset(string $property): bool
     {
         return \in_array($property, ['magicProperty', 'constantMagicProperty'], true);
     }

src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php

@@ -1096,7 +1096,7 @@ public function __get($name)
         }
     }
 
-    public function __isset($name)
+    public function __isset($name): bool
     {
         return 'foo' === $name;
     }