Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  fd57fbcd5f656588fd3f47dfa10ecbe881f44811

SerializerOptions: add entity specific (e.g. for item) properties as default

Moved the related todo, added a new function to remove a property.

Change-Id: I4e8388c3812d478f926568ef596a1e11e27893b9