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We dropped support for Ruby 2.5 in Facter in #2674.
However, this broke compatibility with Puppetserver 7 in rare circumstances in which Facter 4.6.0/4.6.1 was being used in conjunction with Puppetserver < 7.9.0. Up until 7.9.0, Puppetserver used JRuby 9.2.y.z, which is compatible with MRI Ruby 2.5.
This PR reverts the changes made in #2674 and limits Thor to < 1.3.0, as newer versions drop support for Ruby 2.5.