[ruby/rdoc] Update test libraries from ruby/ruby 2023-04-29
From https://github.com/ruby/ruby/commit/74028c210c23a13b3168886efcf837b4bf930468
https://github.com/ruby/rdoc/commit/badc518c57
Added by nobu (Nobuyoshi Nakada) over 2 years ago
[ruby/rdoc] Update test libraries from ruby/ruby 2023-04-29
From https://github.com/ruby/ruby/commit/74028c210c23a13b3168886efcf837b4bf930468
https://github.com/ruby/rdoc/commit/badc518c57