lint error

Author: ncooke3

FirebaseAuth/Sources/Swift/User/User.swift

@@ -1401,7 +1401,7 @@ extension User: NSSecureCoding {}
                                                           action: AuthRecaptchaAction
                                                             .signUpPassword)
           #else
-            let response = try await backend.call(with: request)
+            let response = try await self.backend.call(with: request)
           #endif
           guard let refreshToken = response.refreshToken,
                 let idToken = response.idToken else {