nixpkgs

acb68715 - ruby_2_4: 2.4.5 -> 2.4.9

ruby_2_4: 2.4.5 -> 2.4.9 Changelog: - https://www.ruby-lang.org/en/news/2019/10/01/ruby-2-4-8-released/ - https://www.ruby-lang.org/en/news/2019/10/02/ruby-2-4-9-released/ (cherry picked from commit 5ed9d8b8aaa1ce53b658704e075387678ba19222)