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ARROW-12351: [CI][Ruby] Use ruby/setup-ruby instead of actions/setup-ruby

Because actions/setup-ruby is deprecated:

    Please note: This action is deprecated and should no longer be
    used. The team at GitHub has ceased making and accepting code
    contributions or maintaining issues tracker. Please, migrate your
    workflows to the ruby/setup-ruby, which is being actively
    maintained by the official Ruby organization.

https://github.com/actions/setup-ruby#setup-ruby

Closes #10003 from kou/ci-ruby-setup

Lead-authored-by: Sutou Kouhei <kou@clear-code.com>
Co-authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>