Change stemcell to upgrade to
Change stemcell to upgrade to

[#110841020]

Signed-off-by: Derik Evangelista <70505a31063ee00d819d9d243caf579a659cbb4f@pivotal.io>

pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release