Dmm/update rubocop

[Sgtpluck]

Description of Changes:

• Updates .rubcop.yml to target current versions of ruby/rails
• Includes fixes to get make lint passing

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1. [ ] Have you linted and tested your code locally prior to submission?
2. [ ] Have you tagged the appropriate dev(s) for review?
3. [ ] Have you linked to any relevant tickets or conversations?

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