Add ruby 2.4.3, 2.3.6, 2.2.9, remove 2.4.1, 2.3.4, 2.2.7
Add ruby 2.4.3, 2.3.6, 2.2.9, remove 2.4.1, 2.3.4, 2.2.7

[#153669326]

cloudfoundry/ruby-buildpack,cloudfoundry/ruby-buildpack,cloudfoundry/ruby-buildpack,cloudfoundry/ruby-buildpack,cloudfoundry/ruby-buildpack