Generated USDZ files don't work anymore on VisionOS 1.2 beta

### Description

External issue with VisionOS 1.2 beta, I think worth tracking here as well.
This has been broken before, see https://github.com/google/model-viewer/issues/4354, now it's just broken in a different way.

Webkit bug: https://bugs.webkit.org/show_bug.cgi?id=272575
cc @elalish @grorg

#### Live Demo
- https://modelviewer.dev, click on the AR icon at the bottom right
- https://engine.needle.tools/samples/musical-instrument/
(not using model-viewer but a similar USDZExporter approach as in model-viewer, to show it's not just a model-viewer issue)

### Browser Affected

- [ ] Chrome, version: xx.x.xxxx.xx
- [ ] Edge
- [ ] Firefox
- [ ] IE
- [X] Safari

### OS

- [ ] Android
- [ ] iOS
- [ ] Linux
- [ ] MacOS
- [ ] Windows
- [X] VisionOS

### AR

- [ ] WebXR
- [ ] SceneViewer
- [X] QuickLook