- update to version 5.2.2.1:
https://weblog.rubyonrails.org/2019/3/13/Rails-4-2-5-1-5-1-6-2-have-been-released/
CVE-2019-5418 CVE-2019-5419 CVE-2019-5420

- rb_build_ruby_abi needs to be rb_build_ruby_abis

- limit to ruby 2.5 and above for 42.3/sle12