Incorrect mapping on deserialization of Normal priority in Messaging.AndroidConfig

[almostchristian]

I wrote some unit tests for my application but this mapping caused my test to fail. The message sent to FCM is in the correct mapping however.

https://github.com/firebase/firebase-admin-dotnet/blob/e4f5a55aa3df7d6c943223f1dcfbb9e45324bc37/FirebaseAdmin/FirebaseAdmin/Messaging/AndroidConfig.cs#L103

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