fix: pin rubocop to 1.12 due to error with ruby 2.4 (#8651)
fix: pin rubocop to 1.12 due to error with ruby 2.4 (#8651)

Merge pull request 8651
chrisfinazzo/jekyll,fulldecent/jekyll,jekyll/jekyll,ryanshaw/jekyll,jekyll/jekyll,chrisfinazzo/jekyll,x-way/jekyll,chrisfinazzo/jekyll,ryanshaw/jekyll,chrisfinazzo/jekyll,jekyll/jekyll,ryanshaw/jekyll,x-way/jekyll,x-way/jekyll,fulldecent/jekyll,x-way/jekyll,fulldecent/jekyll,ryanshaw/jekyll,jekyll/jekyll,fulldecent/jekyll