Add bundler 2.2.4, remove bundler 2.2.3
Add bundler 2.2.4, remove bundler 2.2.3

for stack(s) cflinuxfs3 [#176324422]

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