po has always been 0.16.1 not the latest version

## Bug Report
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**To Reproduce**
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1. Step one...

**Expected behavior**
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## Platform Information
- OS: [e.g. iOS 13.4, watchOS 6.2.1, tvOS 9.2.3, macOS 10.14.3, Catalyst 13.0]
- Purchase Type: [e.g. consumable, non-consumable, auto-renewable subscription, non-renewing subscription, discount]
- Environment: [e.g. sandbox, app review, production]
- SwiftyStoreKit version: [e.g. 0.16]

## Additional context
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**Potentially Related Issues**
- Issue #___

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