title: pod 'GoogleMLKit/BarcodeScanning', '2.6.0' ，install error
body: <p><img src="https://i.stack.imgur.com/icM7Y.png" alt="enter image description here" />
  When I use cocoapods to download the pod of Google mlkit / barcode canning, I always report an error? Please help to see what reason, thank you!</p>
  <p>Source check and pod repo update</p>