lang/ruby40: Update to 4.0.2
Changes: https://github.com/ruby/ruby/releases
https://github.com/ruby/ruby/blob/master/NEWS.md https://www.ruby-lang.org/en/news/2026/03/16/ruby-4-0-2-released/
(cherry picked from commit 3beed56b8ee160b87c32b87598820a94f30a853e)