Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  cf97a8df6173e72cc6285f1bef01f67e913662bf

DispatchStats API: Output a ISO 8601 formatted timestamp

This is a breaking change, but brings it more in line with the rest
of the API.

Change-Id: I68f8f8266bea29505128ac71615a7f7b7727d53c