feat: translation(ko) for 2025-12-25-ruby-4-0-0-released.md (#3755)

* feat: translation(ko) for  2025-12-25-ruby-4-0-0-released.md

* fix test-unit version

* fix: updated the document to ensure consistency with previous versions

* Update ko/news/_posts/2025-12-25-ruby-4-0-0-released.md

Co-authored-by: Shia <rise.shia@gmail.com>

* Update ko/news/_posts/2025-12-25-ruby-4-0-0-released.md

Co-authored-by: Shia <rise.shia@gmail.com>

* Update ko/news/_posts/2025-12-25-ruby-4-0-0-released.md

Co-authored-by: Shia <rise.shia@gmail.com>

* Update ko/news/_posts/2025-12-25-ruby-4-0-0-released.md

Co-authored-by: Shia <rise.shia@gmail.com>

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Co-authored-by: Shia <rise.shia@gmail.com>

Author: kimdj2