😵‍💫 Use Qt 6.6 for macos functional tests and windows/mac unit tests

[lesleyjanenorton]

Description

Here we update the following jobs to use Qt 6.6:

• macos functional tests
• windows unit tests
• macos unit tests

To follow later:

• Linux unit and functional tests (Once we've moved / are closer to moving to static Linux builds)
• Wasm tests

Reference

VPN-6368

Checklist

• [ ] My code follows the style guidelines for this project
• [ ] I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• [ ] I have performed a self review of my own code
• [ ] I have commented my code PARTICULARLY in hard to understand areas
• [ ] I have added thorough tests where needed