Hello,
We have found references to UIWebView on this plugin's latest stable version. Looking at the Git repository of both this plugin and its main dependency, there's no immediate workaround/fix for this, since it involves updating the "GoogleMobileAds" framework to at least version "7.55.0" (see release notes).
Can you have a look and see if you can fix it to be compliant with Apple's latest guidelines on not using UIWebView APIs?
Best regards,
Carlos