Update to rubocop 1.12.x for newer ruby support #931
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In #927 the CI builds for 2.7 and 3.0 failed, because rubocop 0.68.x is too old to recognise them.
This PR updates rubocop to 1.12.x, which is the last version that supports ruby 2.4. That version of rubocop also supports 2.7 and 3.0, so this PR will enable #927 to work (after rebasing).
The bulk of the diff in this PR is just running
rubocop --auto-gen-config
after the rubocop update.