fix merge issue

Author: Xiaoshouzi-gh

FirebaseAuth/Tests/Unit/Fakes/FakeBackendRPCIssuer.swift

@@ -77,6 +77,16 @@ class FakeBackendRPCIssuer: AuthBackendRPCIssuer {
   var secureTokenErrorString: String?
   var recaptchaSiteKey = "projects/fakeProjectId/keys/mockSiteKey"
   var rceMode: String = "OFF"
+  
+  override func asyncCallToURL<T>(with request: T, body: Data?,
+                                  contentType: String) async -> (Data?, Error?)
+    where T: FirebaseAuth.AuthRPCRequest {
+    return await withCheckedContinuation { continuation in
+      self.asyncCallToURL(with: request, body: body, contentType: contentType) { data, error in
+        continuation.resume(returning: (data, error))
+      }
+    }
+  }
 
   func asyncCallToURL<T: AuthRPCRequest>(with request: T,
                                          body: Data?,