[Serializer] Add PRESERVE_CONTEXT_TIMEZONE_KEY to DateTimeNormalizer

Change version to 7.4

Co-authored-by: Matty Driessen <mdriessen@users.noreply.github.com>

Author: frankdekker

serializer.rst

@@ -1389,7 +1389,7 @@ normalizers (in order of priority):
 
     .. versionadded:: 7.4
 
-        The ``DateTimeNormalizer::FORCE_TIMEZONE_KEY`` context option was introduced in Symfony 7.3.
+        The ``DateTimeNormalizer::FORCE_TIMEZONE_KEY`` context option was introduced in Symfony 7.4.
 
 :class:`Symfony\\Component\\Serializer\\Normalizer\\ConstraintViolationListNormalizer`
     This normalizer converts objects that implement