Use Ruby 3.2.1-based Docker image
What does this MR do and why?
For: #1385 (closed), update gitlab-docs project to use new Ruby 3.2.1-based images.
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.