MCSPRT-417: aAjax batchSave() method should be static, php8 compatibi…

…lity

Included in CiviCRM 5.57.0
PR: civicrm#25029

CRM/Batch/Page/AJAX.php

@@ -23,7 +23,7 @@ class CRM_Batch_Page_AJAX {
   /**
    * Save record.
    */
-  public function batchSave() {
+  public static function batchSave() {
     CRM_Core_Page_AJAX::validateAjaxRequestMethod();
     // save the entered information in 'data' column
     $batchId = CRM_Utils_Type::escape($_POST['batch_id'], 'Positive');