Pull Request #46 Relax dependent `thor` version to fix CI
Thor as of v0.20.x relied on `open-uri` that was deprecated since Ruby version 3.
https://github.com/ruby/ruby/blob/v3_0_0/NEWS.md#compatibility-issues
Thor v1.x uses `URI.open` so that it is compatible with Ruby 3.x.
https://github.com/rails/thor/pull/677
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