Xcode 15 - Broken for vision os

## Bug Report
Project not building

**To Reproduce**
1. Add Apple vision platform for existing project
2. it does not build, says "SKDownload not available in xrOS"

**Expected behavior**
It should at least build properly by making features which are not possible in xrOS

## Platform Information
- OS: Vision OS 1.0
- SwiftyStoreKit version: 0.16.4

## Additional context

**Potentially Related Issues**

**Screenshots**