Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  bd534b3e8cd3296f723c51f4b24e9284acf3a739

Fix WikibaseLuaBindings after SiteLinkLookup change

After I67824712f SiteLinkLookup::getItemIdForLink no longer
returns int.

Change-Id: I67d78661de8469a9578420a8ab1421622197c5d3