Test with NodeJS 20

[hardillb]

part of #5403

Description

Update tests to using NodeJS 20

Related Issue(s)

#5403

Checklist

• [ ] I have read the contribution guidelines
• [ ] Suitable unit/system level tests have been added and they pass
• [ ] Documentation has been updated
  • [ ] Upgrade instructions
  • [ ] Configuration details
  • [ ] Concepts
• [ ] Changes flowforge.yml?
  • [ ] Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • [ ] Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• [ ] Includes a DB migration? -> add the area:migration label

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.01%. Comparing base (ec2ac60) to head (b011623).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5433   +/-   ##
=======================================
  Coverage   77.01%   77.01%           
=======================================
  Files         358      358           
  Lines       16930    16930           
  Branches     3955     3955           
=======================================
  Hits        13039    13039           
  Misses       3891     3891           

Flag	Coverage Δ
backend	77.01% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

:rocket: New features to boost your workflow:

• :snowflake: Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• :package: JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.