Update serializer.rst

Co-authored-by: Oskar Stark <[email protected]>

Author: lyrixx

serializer.rst

@@ -157,7 +157,7 @@ The context is passed to all normalizers. For example:
 * :class:`Symfony\\Component\\Serializer\\Normalizer\\DateTimeNormalizer` uses ``datetime_format`` key as date time format;
 * :class:`Symfony\\Component\\Serializer\\Normalizer\\AbstractObjectNormalizer` uses ``empty_iterable_as_object`` to preserve empty objects (keeps ``{}`` instead of ``[]`` in JSON);
 
-.. versionadded:: 5.3
+.. versionadded:: 5.4
 
     :class:`Symfony\\Component\\Serializer\\Serializer` uses ``empty_arrays_as_object`` to serialize empty array as object (uses ``{}`` instead of ``[]`` in JSON);