Update Rubocop to 0.69.0 and other gems
This fixes Ruby 2.6.x parser warnings: https://github.com/rubocop-hq/rubocop/pull/7009
CE port: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/28345
Edited by Stan Hu
This fixes Ruby 2.6.x parser warnings: https://github.com/rubocop-hq/rubocop/pull/7009
CE port: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/28345