Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  8c5449ae46d67aa3fcc3480244a51a4f1e234b08

(bug 62425) Property of main Snak must not change

When updating a Claim, the new main Snak must refer to the same
Property as the old main Snak.

Change-Id: Id23a1ea6ad50af9a3ad96b77e5753c60245722ba