Updated mediawiki/extensions/Wikidata
Project: mediawiki/extensions/Wikibase  7645915b31a0d7088fbc5b550774fb805b322c0d

Upgrade to WikibaseDataModel 2.0 and add a missing use clauses

See https://github.com/wmde/WikibaseDataModel/pull/218 for a few more
explanations.

Change-Id: I687c61c418d3a0a52b945356c5eb5ce60b3d994f