[ruby/stringio] Fix Ruby 3.4 check
https://github.com/ruby/stringio/commit/a27c5d5e2e
Co-authored-by: Sutou Kouhei kou@cozmixng.org
[ruby/stringio] Fix Ruby 3.4 check
https://github.com/ruby/stringio/commit/a27c5d5e2e
Co-authored-by: Sutou Kouhei kou@cozmixng.org