lang/ruby31: Update to 3.1.5

After the release of 3.1.3 Ruby 3.1 series has entered security
maintainance phase that only security fixes are provided. And it is
expected to reach its EoL on March 31, 2025. So mark DEPRECATED to
encourage user to migrate to newer version, and set EXPIRATION_DATE to
its expected EoL day.

ReleaseNotes: https://www.ruby-lang.org/en/news/2024/04/23/ruby-3-1-5-released/
MFH: 2024Q1
Security: 2ce1a2f1-0177-11ef-a45e-08002784c58d