Add Support for Ruby 4.0.0

[sireeshajonnalagadda]

Devcontainer image
Ruby

Adding support for Ruby 4.0 version

Changes
Updated the manifest and Dockerfile and Readme files

Checklist
Changes works as expected

[Copilot]

Pull request overview

This PR attempts to add support for Ruby 4.0 by updating the devcontainer image configuration from Ruby 3.x to Ruby 4.x versions. The changes include a major version bump (2.0.5 → 3.0.0) in the manifest and comprehensive updates to variant tags, README documentation, and Dockerfile configurations.

Critical Issue: Ruby 4.0, 4.2, 4.3, and 4.4 do not exist. As of January 2025, the latest stable Ruby versions are in the 3.x series (3.2.x, 3.3.x, 3.4.x). This PR references nonexistent versions throughout all files, which will cause build failures.

Key Changes:

• Manifest version bumped from 2.0.5 to 3.0.0 (major version change)
• All variants updated from 3.x series to 4.x series (4.2, 4.3, 4.4)
• README documentation updated to reflect Ruby 4.x versions
• Default Dockerfile variant changed to 4-trixie

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/ruby/manifest.json	Updates version to 3.0.0 and replaces all Ruby 3.x variants with nonexistent 4.x variants (4.2, 4.3, 4.4) across variants list, architectures, and variantTags
src/ruby/README.md	Updates documentation to reference nonexistent Ruby 4.x versions in variant tables, image tags, and semantic versioning examples
src/ruby/.devcontainer/Dockerfile	Changes default VARIANT to 4-trixie but leaves comment still referencing Ruby 3.x versions