sklearn addition of normalized_stress parameter to manifold.MDS

[RobertSamoilescu]

sklearn 1.2 included an new parameter, normalized_stress, to the manifold.MDS. Until 1.4., the default value is warn which will print a warning, but then replaced by False. Following 1.4. the default value will be False which is actually the intended behavior. Thus, most likely no code base change will be required.