Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  1dc9160bac61ef2e15b071a06656b5371f1cf3b6

Rewrite NamespaceUtils to be non-static and use one instance

On a medium-size item, NamespaceUtils::getEntityNamespace 
was called 935 times, taking noticeable amount of time
in profiling results.

Change-Id: I9de1c739581a4e2fb0aaaef4cb6506a90e29f2b8