Virtual-environments: Update Ruby to 2.5.7

[frankieroberto]

Tool information

• Tool name: Ruby
• Add or update? Update
• Desired version: 2.5.7 (currently 2.5.5) this is a security update
• Approximate size:

This has been requested by several people on the setup-ruby action, see https://github.com/actions/setup-ruby/issues/36

Virtual environments affected

• [ ] macOS 10.15
• [x] Ubuntu 16.04 LTS
• [x] Ubuntu 18.04 LTS
• [ ] Windows Server 2016 R2
• [ ] Windows Server 2019

[fbjork]

+1

[Bertk]

Please also consider the ruby 2.6.5 update.

• _this version is by https://github.com/Microsoft/azure-pipelines-image-generation_

[wagnerpereira]

+1

[frankieroberto]

I think this has now been resolved - ruby 2.5.5 has been removed, and 2.5.7 is now available.

See https://github.com/actions/virtual-environments/issues/281#issuecomment-575520911