Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  2b9ef68299ff1002a9ae8fd3df1dd10a4bf9e918

Adopt to changes in ApiBase/ ApiFormatBase

Needed after core change I04b1a3842.

Change-Id: Ibe98e62c26ecf9a31c9beea8b2ab7823e8b2ce73