Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  3e8f760e77a75319e447b52e5648cde73f46cbe1
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(hotfix) fixing calls of Sites::singleton in ClientChangeHandler

patchset 2: addressed jeroens comments

Change-Id: I1c6470061ddcfa9fb9d24038297e6d67b599957e