build: Bump devDependencies to latest
build: Bump devDependencies to latest

 grunt-contrib-cssmin     0.14.0  →    1.0.1
 grunt-contrib-uglify     0.11.0  →    1.0.1

Change-Id: Ia829911552ac0cf32bd9ffd0fa8d350bc964a85a

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui