[auth-swift] Fix runtime warnings detected by Xcode 15 b3 #11518
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Fix warnings like Attempted to decode a collection type 'NSString' (subclass of 'NSObject') for key 'NS.keys'. 'NSString' requires its subclasses to be explicitly added to the allowed classes list but it is not present. Allowing this has been a source of security issues that are shown in Xcode 15 beta 3
Also, added a few missing iOS 13 availability checks.
#no-changelog