Remove Ruby 2.7 support
What does this MR do and why?
There are build failures related to Ruby 2.7: https://gitlab.com/gitlab-org/ruby/gems/devfile-gem/-/pipelines/1133599653. Related thread: !52 (comment 1734240269)
We no longer need ruby 2.7 support in the monolith, so we can remove support for it from this gem.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Chad Woolley