File _servicedata of Package stardust-xr-gravity

<servicedata>
<service name="tar_scm">
                <param name="url">https://github.com/StardustXR/gravity.git</param>
              <param name="changesrevision">3283bf8b352cdcb04ef3e0edb5155c4ca8c5c97c</param></service></servicedata>