Fix broken duplicate element detection when reading POM

  <!-- Remove when Resolver 2.0.0-alpha-4 is on Maven Central -->
  <repositories>
    <repository>
      <id>maven-2046</id>
      <name>Resolver 2.0.0-alpha-4 staging</name>
      <url>https://repository.apache.org/content/repositories/maven-2046</url>
    </repository>
  </repositories>  <repositories>
    <repository>
      <releases>
        <enabled>false</enabled>
      </releases>
      <snapshots>
        <enabled>true</enabled>
      </snapshots>
      <id>apache.snapshots.https</id>
      <name>ASF Snapshots</name>
      <url>https://repository.apache.org/content/repositories/snapshots/</url>
    </repository>
  </repositories>