add ruby 3.x support, drop support for ruby 2.3 and below #26
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Ruby 3.x has been around for over a year, and Ruby 2.3 has been EOL for three years. This PR adds support for Ruby 3.x while removing support for Ruby 2.3 and below. It's all dependency and CI changes because the code is already compatible with Ruby 3.0 and 3.1.
See Ruby's official branch maintenance for exact EOL and release dates.