Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  592492b9c8456ec5a3bde49c46ae76f037581aa2
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Changed ClaimAggregate::getClaims to return Claim[] rather then Claims

Some follow up changes can be made, in particular updating Entity::setClaims could similarly be changed.
Not doing this now to keep this commits size maneagable

Change-Id: I9b144f3dceb5e03a03b5e56d5112d8bd7cbfdacb