Stellarium / stellarium / 23317448775

Pull #4776

github

Upgrade Appveyor for Arm64 build

- revert to Qt6.5 because 6.9 has issues running windeployqt
- 6.10 would be preferred to have QtWebEngine and QtTextToSpeech

After much experimentation, most changes have been removed or commented away for experiments post-26.1. In between, we had:
- enable some verbosity for deployment on Windows
- updates $PATH
- Create qtstuff directory even if empty
- try triggering windeployqt manually
- Exclude all plugins to speed up building while trying to understand the build process
- where is the program?
- try to call windeployqt manually and see what happens

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