Bump ruby version to 2.3.5 for security fixes.
See: https://www.ruby-lang.org/en/news/2017/09/14/ruby-2-3-5-released/
cc\ @connorshea @briann
Should be picked into 9.5, 9.4, and 9.3 as well.
See: https://www.ruby-lang.org/en/news/2017/09/14/ruby-2-3-5-released/
cc\ @connorshea @briann
Should be picked into 9.5, 9.4, and 9.3 as well.