Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  42121dd3f9814438e4f4c915a4c732cbd6c67aaf

Add extra ChangeOpClaim tests

This adds checks for adding claims with
the same guids which was technically possible
before the previous commit.

Change-Id: If50f6a078c85df9fe8796574d500e07b9a1413be