Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  489488ac3cf31761d290a013e7b13c301e829265

Always use the same autoloading mechanism for DataModel

This fixes autoload falure in case of running tests via MW where DataModel gets
included via a test bootstrap and not some LocalSettings

Change-Id: I50af027aad9235afd0b0031a7a3dd438bf39c70a