fix: FORMS-1588 update node to v20

[WalterMoar]

Description

Node.js is how we run the JavaScript code that makes up the application. The version that we choose is in the “sweet spot” where it’s a long term support (LTS) version that is still maintained, but it isn’t be actively developed (fewer changes).

We use Node.js in three places:

1. The running CHEFS application, frontend and backend, in the deployed PRs, dev, test, and prod
2. The “devcontainers” used by developers to work on the application
3. The GitHub Actions that are the Continuous Integration / Continuous Deployment (CI/CD) pipeline used to automatically build, test, and deploy the application

Type of Change

fix (a bug fix)

Checklist

• I have read the CONTRIBUTING doc
• I have checked that unit tests pass locally with my changes
• I have run the npm script lint on the frontend and backend
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• I have approval from the product owner for the contribution in this pull request

[WalterMoar]

Closing this to reopen and see if the Node 18/20 issue with the tests goes away.