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This PR is dropping support for RSpec 2 for the following reasons:
RSpec 2 doesn't work with Ruby 3.2:
#107
It's been nearly ten years since the last release of RSpec 2 (June 01, 2014): https://rubygems.org/gems/rspec/versions/2.99.0
There would have been a use case in April 24, 2013 when the test-queue 0.1.0 was first released: https://rubygems.org/gems/test-queue/versions/0.1.0
But I can't imagine a use case for continuing to upgrade test-queue with RSpec 2 in 2023.