Prod: Switch to Node v4.6.0
Prod: Switch to Node v4.6.0

Bug: T148615
Change-Id: Ie5a0733232679b756d8f8a8425e41969f1f138f9

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps