Update bundler
Update bundler

norsk only supporst bundler >= 1.17.3

Co-authored-by: David Ansari <e90f4e31c5c98af61911a1b3ffe0d70ed0c82fb3@pivotal.io>

pivotal-cf/rabbit-labrat,pivotal-cf/rabbit-labrat,pivotal-cf/rabbit-labrat