Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  e85a7fafd97fb73b4fa06a3e2c40d1cbce871ce4

Add @group medium to WikiPageEntityRevisionLookupTest

This occasionally times out, for example:
https://travis-ci.org/wikimedia/mediawiki-extensions-Wikibase/jobs/39629830

Change-Id: Ie454e65ab91506ce85d0aa84aa941e0d6981a454