Pin to specific release of static buildpack
Pin to specific release of static buildpack

Newest version of static buildpack deprecated nginx for older stacks
breaking legacy integration tests

[#168848842](https://www.pivotaltracker.com/story/show/168848842)
Co-authored-by: Jenna Goldstrich <ece644b3066e86d728b815a5811e74b079a9aacc@pivotal.io>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli