chore: Make therubyracer conditionally installed #1716
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This PR makes the
therubyracer
testing tool install only on Ruby versions lower than 3.1.0.This testing tool is used to run tests for Less, the templating library.
In order to get to a green build, this change exempts therubyracer and the Less tests from the CI build for "3.1.0" or later.
See #1715
Result: an installation that works, and then a few test failures. This is progress.
Number 4 is due to a new feature in Ruby, the error description ^^^^ notes, which accompany a raised exception. See https://github.com/ruby/error_highlight#examples