Add rubygems 3.2.16, remove rubygems 3.2.15
Add rubygems 3.2.16, remove rubygems 3.2.15

for stack(s) cflinuxfs3 [#177697358]

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