Fix bug where error line numbers were incorrect in Rails 8.1 #2502
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Rails 8.1 added a newline to the compiled ERB output in rails/rails#53731, so we need to change our class_eval'd line number depending on the Rails version at compile time, but only for ERB.
I also made some appraisal updates here that get us closer to passing on Rails and Ruby main, but we are blocked by Nokogiri not supporting Ruby 4. I'm guessing that will change in the next couple of weeks ❤️