title: When building with React Native, an error occurs related to @ react-native-firebase / messaging
body: <p>We are developing a smartphone app with React-Native.
  It worked fine until last week, but suddenly I couldn't even build it from around the day before yesterday, and now I get the following error:</p>
  <pre><code>
  /PRJDIR/node_modules/@react-native-firebase/messaging/ios/RNFBMessaging/RNFBMessagingSerializer.m:34:40: expected a type
  + (NSDictionary *)remoteMessageToDict:(FIRMessagingRemoteMessage *)remoteMessage {
  
  /PRJDIR/node_modules/@react-native-firebase/messaging/ios/RNFBMessaging/RNFBMessagingSerializer.m:35:58: property 'appData' not found on object of type '__strong id'
    return [self remoteMessageUserInfoToDict:remoteMessage.appData];
  
  /PRJDIR/node_modules/@react-native-firebase/messaging/ios/RNFBMessaging/RNFBMessagingModule.m:295:29: no visible @interface for 'FIRMessaging' declares the selector 'sendMessage:to:withMessageID:timeToLive:'
    [[FIRMessaging messaging] sendMessage:data to:to withMessageID:messageId timeToLive:[ttl intValue]];
                                                        ^
  error Failed to build iOS project. We ran &quot;xcodebuild&quot; command but it exited with error code 65. To debug build logs further, consider building your app with Xcode.app, by opening PRJ.xcworkspace. Run CLI with --verbose flag for more details.
  
  </code></pre>
  <p>The development environment is as follows.</p>
  <ul>
  <li>iOS14.4(Simulator iPhone12)</li>
  <li>react：16.9.0</li>
  <li>react-native：0.61.5</li>
  <li>@react-native-firebase/messaging：7.4.2</li>
  <li>XCode：12.4 (12D4e)</li>
  <li>node.js：12.3.1</li>
  </ul>
  <p>I have tried the following.</p>
  <ul>
  <li>@react-native-firebase/messagingを7.9.2へアップグレード</li>
  <li>キャッシュ削除</li>
  <li>node_modulesとpackage-lock.jsonの削除、npm install</li>
  <li>PodsとPodfile.lockの削除、pod install</li>
  </ul>
  <p>I've been worried for about 3 days, but I haven't been able to solve it ...
  If you know the solution, please let me know.</p>