Function ajour_core::utility::download_update_to_temp_file

pub async fn download_update_to_temp_file(
    bin_name: String, 
    release: Release
) -> Result<(PathBuf, PathBuf), DownloadError>

Downloads the latest release file that matches bin_name, renames the current executable to a temp path, renames the new version as the original file name, then returns both the original file name (new version) and temp path (old version)