[Auth] Use constants for 'supportsSecureCoding' implementation #13988
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The static var does not compile in Swift 6 due to shared mutable state. To
work around, you can use a constant or a computed var. To standardize things,
I chose to go with a constant.
This should not affect how the types conform to NSSecureCoding as a constant
can be used to implement a protocol getter-only property. See
https://stackoverflow.com/a/38281420/9331576
#no-changelog