HX-PGS-AIM-IOS/Assets/GoogleMobileAds/Editor/GoogleUmpDependencies.xml

<dependencies>
  <androidPackages>
    <androidPackage spec="com.google.android.ump:user-messaging-platform:2.1.0">
      <repositories>
        <repository>https://maven.google.com/</repository>
      </repositories>
    </androidPackage>
  </androidPackages>
</dependencies>