Updated mediawiki/extensions
Project: mediawiki/extensions/DataValues  59227570f908fd81b3b10bb9e987a78c02cd58cd

(bug #55512) QuantityValue rewrite based on DecimalValue

NOTE: merge Ie7f15f3585fda into WikibaseDataModel first, to avoid
breaking tests.

Change-Id: I1d1cb7367d7de38530ab2890bb87d178efda2cf8