[ruby] Update Ruby 4.0.4 → 4.0.5

[depfu]

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

Release Notes

4.0.5

Posted by k0kubun on 20 May 2026

      <p>Ruby 4.0.5 has been released.</p>

This release only contains a security fix for CVE-2026-46727: Use-after-free in pthread-based getaddrinfo timeout handler and a build system regression in Ruby 4.0.4 under C locale [Bug #22065].

Please see the GitHub releases for further details.

Release Schedule

We intend to release the latest stable Ruby version (currently Ruby 4.0) every two months following the most recent regular release. Ruby 4.0.6 will be released in July, 4.0.7 in September, and 4.0.8 in November.

If a change arises that significantly affects users, a release may occur earlier than planned, and the subsequent schedule may shift accordingly.

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