Updated mediawiki/extensions/Wikidata
Project: mediawiki/extensions/Wikibase  6fbc2bd8030fb2b64cdfc4972535365c917b271e

Allow reseting WikibaseClient's default instance

This breaks tests as they rely on being able to change this
mid-request.

Change-Id: I814c05243515f0babd153bded344ec2a124e6a65