update binary builder to keep both old 1.X.X, and new 2.X.X bundler
update binary builder to keep both old 1.X.X, and new 2.X.X bundler

[#162976046]

Co-authored-by: Daniel Thornton <5874b3971aa460e96f75d4dbef8f6aadb66f1697@pivotal.io>

cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci