chore(): Updated Swift Pigeon codec type name

Author: tyllark

packages/amplify_datastore/example/ios/unit_tests/NativeAuthPluginTests.swift

@@ -14,7 +14,7 @@ class MockBinaryMessenger: NSObject, FlutterBinaryMessenger {
 
     let isSignedIn: Bool
 
-    lazy var codec = NativeAuthPluginCodec.shared
+    lazy var codec = NativePluginBindingsPigeonCodec.shared
 
     func send(onChannel channel: String, message: Data?) { }