* Update to rubocop 1.12.x for newer ruby support
* fix: remove deprecated warnings from Bundler
* fix: ruby warnings about MAGIC_COMMENTS already defined
* fix: Gemfile.lock for integration tests
Co-authored-by: Andy Allan <git@gravitystorm.co.uk>
Co-authored-by: Cuong Tran <ctran@users.noreply.github.com>
