Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  0d9a6aeba80193a1a0f8ee2effacb81c075ace41

Move SpecialPageTestBase from repo

This base class is in lib and it creates a fatal error to try to
look it up on repo.

Change-Id: I71393ca2eec974f06b1d5c3ea77f971fddc43543