build: Bump development dependencies to latest
build: Bump development dependencies to latest

 grunt-contrib-uglify   2.2.0  →  2.3.0
 qunitjs                2.1.1  →  2.3.0

Change-Id: If82d978eec158f1398820aa5bd0645adc8a42e5d

wikimedia/oojs,wikimedia/oojs