Looks like there is no specific import version listed. But: My local AEM 6.4 instance does not export that Java package "com.day.cq.dam.core" at all (in no version). That explains at least the behavior of your AEM instance.
But that leaves the question: How do you create such a MANIFEST.MF? Do you port the code from an older AEM version to AEM 6.4? Was it running there properly? And then you might check that you don't have such import statements hardcoded in your pom.xml