Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  e34f701bafc12d43bcca7fdc767bc92bf674424c

Adjust ReferenceSerializer tests to change in WikibaseDataModel

Refers to change I2ce18fb2151d7d940bb020bcb7a594d74bfea35d

Change-Id: I36f5a98a443c4a1f1ba9e5e85cc3de676f812637