AuthFailure.swift is missing @objc on it's properties

[uwe-neuronation]

✍️ AuthFailure.swift is missing @objc on it's properties

The new class AuthFailure uses @objc for itself, but is missing it on it's properties.

I use it on MAUI, that needs ObjectiveC compatibility to access nativ functions/properties on C# level. It was done on all other classes but is missing here.

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📦 Iterable SDK version: iOS 6.6.1

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