<input type="text" class="form-text required" maxlength="255" size="60"
value="" name="title" id="edit-title">

$('.form-text required').removeAttr('class')
       But
       Drupal: If any hard code in hook_form_alter

function YOUR_MODULE_form_alter(&$form, &$form_state, $form_id){
  switch($form_id){
    case 'YOUR_FORM_ID':
      $form['title']['#required'] => FALSE;
      break;
  }
  return $form;
}