Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  15d19a58593a922f6ac9a1cf0e021717e56610b8

Restore (still used) getItemUsageIndex in DirectSqlStore

we still need this code in working, deployable condition...

Bug: 72335
Change-Id: I02f82895465bd4a87f8e61d6d88608361e12ac3e