Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  04239e53c1ca5504742c42dd7dcf8d973d67d0f5

Rename getSiteLinkTable to getSiteLinkLookup

Looks like the interface was introduced later and that's why the
getter is called after the sub class instead of the interface.

Change-Id: Ib41e33e8306ac4cdf7d82342a5b72784c08405b3