Support Ruby 3.4

[Kaniska244]

Ref: #90

Devcontainer name

Ruby

Description

This pr adds 3.4 latest ruby version to the supported versions list in ruby image.

Changelog

• Changes are there in manifest.json and readme.md file for ruby image to add support to latest 3.4 ruby version.

Checklist

• Checked that applied changed work as expected

[NelcifranSofto]

wow Finally !!!!

[ddoyle2017]

Changes look good! However, the Dockerfile also needs to be updated with a reference to 3.4

[ddoyle2017]

Thanks for updating the Dockerfile! There's a small error that needs to be fixed and I think we're good to go

[cgrothaus]

The docker image for 3.4 is not yet published (https://mcr.microsoft.com/en-us/artifact/mar/devcontainers/ruby/tags only has dev-3.4). When will this happen?
(Sorry if I am asking questions that would better be asked somewhere else – I don't know how this is all connected).