Array
(
    [code] => rest_cannot_edit
    [message] => Sorry, you are not allowed to edit this user.
    [data] => Array
        (
            [status] => 401
        )

 )

function update_user_api( $entry, $form ) {
    $user_url = 'https://myurl.com/wp-json/wp/v2/users/11?context=edit';
     $body = array(
        'username' => '000',
        'password' => '000',
        'first_name' => 'test',
      );
      $response = wp_safe_remote_post( $user_url, array( 'body' => $body ) );
       $res = json_decode($response['body'], true);
       echo '<pre>';
          print_r($res);
       echo '</pre>';
}
add_action( 'gform_after_submission_16', 'update_user_api', 10, 2 );