Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  2934b8f10cfe6f050be2175ac4f2896aacb29e7f

Set GUID in Claims used in tests.

This is in preparation for changes to the Claims class,
see Id8706caf6d47f6d.

Change-Id: I78f89228f06176ee4062fbb5c25f06d6aff89154