Merge branch 'test-mail-smtp-pool-ruby-3-2' into 'master'

Test mail-smtp_pool on Ruby 3.1 and 3.2

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/130045



Merged-by: Stan Hu <stanhu@gmail.com>
Approved-by: Hitesh Raghuvanshi <hraghuvanshi@gitlab.com>
Approved-by: Stan Hu <stanhu@gmail.com>
Reviewed-by: Heinrich Lee Yu <heinrich@gitlab.com>
Co-authored-by: Heinrich Lee Yu <heinrich@gitlab.com>