[spwitt]

Deploy failed

Error: Unavailable version 3.4.2 for ruby on ubuntu-26.04
          Only the latest patch release of each series is built for newer runner images.
          ruby-3.4.12 is available on ubuntu-26.04: use ruby-version: '3.4.12', or '3.4' to always use the latest 3.4.x release.

Bumped to 3.4.12 as mentioned in the error.

[spwitt]

Self-review

[Copilot]

🟢 Approval recommended

No active review issues are reported for the Ruby 3.4.12 development-runtime update.

No open issues 🎉

What changed in this PR

Updates the Ruby client’s development runtime from 3.4.2 to 3.4.12 to address the reported deployment failure on Ubuntu 26.04.

Changes:

• Aligns the Gemfile requirement and .ruby-version with Ruby 3.4.12.
• Updates the lockfile’s Ruby version metadata to 3.4.12p148.

File	Description
Gemfile.lock	Records Ruby 3.4.12p148 in runtime metadata.
Gemfile	Requires Ruby 3.4.12.
.ruby-version	Selects Ruby 3.4.12 for version-manager tooling.

_{Review effort: Balanced}