Update dependencies for May 2020

[DeeDeeG]

Context

• Update some out of date dependencies (jquery, kaminari, puma, rails)

Summary of Changes

• update kaminari, puma and rails in Gemfile/Gemfile.lock
• update jquery in yarn.lock

Checklist

• [ ] Tested Mobile Responsiveness
• [ ] Added Unit Tests
• [x] CI Passes
• [ ] Deploys to Heroku on test Correctly (Maintainers will handle)
• [ ] Added Documentation (Service and Code when required)

[DeeDeeG]

More stuff to add to this, not ready to merge, thanks.

[DeeDeeG]

CI passed, seems alright now. Planning to merge tomorrow if there's no objections.