Drupal 8 remove css,js query strings

Update your THEMENAME.theme

/**
 * Implements hook_css_alter().
 */
function boostrap_css_alter(&$css, AttachedAssetsInterface $assets) {
  foreach ($css as &$file) {
    if ($file['type'] != 'external') {
      $file['type'] = 'external';
      $file['data'] = '/' . $file['data'];
    }
  }

}

/**
 * Implements hook_js_alter().
 */
function boostrap_js_alter(&$javascript, AttachedAssetsInterface $assets) {
  foreach ($javascript as &$file) {
    if ($file['type'] != 'external') {
      $file['type'] = 'external';
      $file['data'] = '/' . $file['data'];
    }
  }
}