Upgrade to Express 5

[drewbo]

Express 5 is the first major version upgrade in a decade. It has two nice improvements for us: improved promise rejection handling (which has caused errors or annoying code her in the past) and reduction of (older) dependencies

Notes

• https://www.trevorlasn.com/blog/whats-new-in-express-5

Acceptance Criteria

• Application uses express 5