Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  d171a2ef19786d97e7ae3d75d863a6c5a9f6ea8a

Basic validation for snaks JSON in SetReference

Also remove broken example URLs (per DanielK).

Bug: 47553
Change-Id: If9b95653a04b35b2e85e9415870d708d5bf2603d