po has always been 0.16.1 not the latest version

[Liyongcong]

Bug Report

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To Reproduce
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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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