Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  270b0a6757ca8de1aca73edae9676a86d8f0e7ec

(bug 46565) Don't prune undispatched changes.

This makes the pruneChanges script consider which changes have been dispatched yet.

Change-Id: Ic7663a6153a75548c3984a9d61664ff85c934f3d