Merge pull request #6866 from samvera/corrects_created_at_predicate

Corrects the sharing of predicates between date_created and created_at.

config/metadata/hyrax_internal_metadata.yaml

@@ -14,7 +14,7 @@ attributes:
   compression:
     predicate: http://vocabulary.samvera.org/ns#compressionScheme
   created_at:
-    predicate: http://purl.org/dc/terms/created
+    predicate: http://vocabulary.samvera.org/ns#created_at
   file_identifier:
     predicate: http://vocabulary.samvera.org/ns#fileIdentifier
   file_ids: