Test mail-smtp_pool on Ruby 3.1 and 3.2
What does this MR do and why?
Adds Ruby 3.1 and Ruby 3.2 CI jobs for mail-smtp_pool
gem.
Link to passing child pipeline in this MR: https://gitlab.com/gitlab-org/gitlab/-/pipelines/977293978
Related to #422363 (closed)
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by Heinrich Lee Yu