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Describe the bug
Refuses to build with Xcode 14b1 due to requirement for stored properties to not have availability markings

1. Environment
   1. Platform: Xcode 14 (new beta)
   2. SDK version: 4.5.1
   3. StoreKit 2 enabled (Y/N): n/a
   4. OS version: n/a
   5. Xcode version: Xcode 14 beta 1
   6. How widespread is the issue. Percentage of devices affected: 100% unable to build
2. Debug logs that reproduce the issue
3. Steps to reproduce, with a description of expected vs. actual behavior
4. Other information (e.g. stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, etc.)

Additional context
Add any other context about the problem here.