Bump development Ruby version to 3.3.7 and update Alpine to 3.21
What does this MR do and why?
Upgrade to Ruby 3.3.7 to reduce the number of Ruby versions being installed. I also upgraded the Alpine version since I didn't find a Ruby 3.3.7 image for Alpine 3.19 in the official Ruby Alpine images.
Related to gitlab-development-kit#2369 (closed)
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
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Configure a local GitLab Docs environment: https://gitlab.com/gitlab-org/gitlab-docs/-/blob/main/doc/setup.md.
Merge request 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 merge request.
Edited by Nao Hashizume