title: #include <nanopb/pb.h> Could not build module 'nanopb'
body: <p>I know this has been answered previously on Stack however, the reason for this was outdated cocoapods (not being at least version 1.2.0)</p>
  <p>I am currently running version 1.9.3 and using Xcode 12 and still getting this error.</p>
  <p>I have done the usual steps to see if the following will solve the issue;</p>
  <ol>
  <li>Cleaned Build Folder</li>
  <li>Removed derived data</li>
  <li>Restarted Xcode</li>
  <li>Updated Cocoapods</li>
  <li>Checked Cocoapods is on latest version</li>
  </ol>
  <p>I believe this is a module pulled in along with Firebase/Firestore</p>
  <p>pods used:-</p>
  <ul>
  <li>pod 'Firebase/Auth'</li>
  <li>pod 'Firebase/Messaging'</li>
  <li>pod 'Firebase/Analytics'</li>
  <li>pod 'FirebaseFirestoreSwift'</li>
  <li>pod'Firebase/Database'</li>
  <li>pod 'Firebase/Crashlytics'</li>
  </ul>
  <p><a href="https://i.stack.imgur.com/gP0bg.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gP0bg.jpg" alt="enter image description here" /></a></p>