lang/ruby40: Update to 4.0.4
Changes: https://github.com/ruby/ruby/releases
https://github.com/ruby/ruby/blob/master/NEWS.md https://www.ruby-lang.org/en/news/2026/05/11/ruby-4-0-4-released/
(cherry picked from commit 81ce8cb5b0cb97f34653f15f622398ef55771d86)