Membership batch processing error

This fixes a fatal because of incorrect typing

Affects 5.40

CRM/Batch/Form/Entry.php

@@ -1018,7 +1018,7 @@ class CRM_Batch_Form_Entry extends CRM_Core_Form {
    * @throws \CRM_Core_Exception
    * @throws \CiviCRM_API3_Exception
    */
-  protected function legacyProcessMembership($contactID, $membershipTypeID, $customFieldsFormatted, $membershipSource, $memParams = [], $formDates = []): CRM_Member_BAO_Membership {
+  protected function legacyProcessMembership($contactID, $membershipTypeID, $customFieldsFormatted, $membershipSource, $memParams = [], $formDates = []): CRM_Member_DAO_Membership {
     $updateStatusId = FALSE;
     $changeToday = NULL;
     $is_test = FALSE;