ANTM/Assets/GooglePlayGames/Editor/GooglePlayGamesPluginDependencies.xml

<?xml version="1.0" encoding="UTF-8" ?>
<dependencies>
<!-- Internal library dependency generated at build time. 
    It also defines the transitive dependencies on play-services
-->
  <androidPackages>
    <androidPackage spec="com.google.games:gpgs-plugin-support:0.9.50">
      <repositories>
        <repository>Assets/GooglePlayGames/Editor/m2repository</repository>
      </repositories>
    </androidPackage>
  </androidPackages>
</dependencies>