ENGCOM-5370: Getting 404 url while updating quantity on multiple address cart page #22717

 - Merge Pull Request #22717 from vikalps4/magento2:2.3develop-pr1
 - Merged commits:
   1. 0fe651d
   2. 334fefe

Author: magento-engcom-team

app/code/Magento/Multishipping/view/frontend/templates/checkout/addresses.phtml

@@ -18,7 +18,7 @@
       data-mage-init='{
           "multiShipping":{},
           "cartUpdate": {
-               "validationURL": "/multishipping/checkout/checkItems",
+               "validationURL": "<?= $block->escapeUrl($block->getUrl('multishipping/checkout/checkItems')) ?>",
                "eventName": "updateMulticartItemQty"
           }}'
       action="<?= $block->escapeUrl($block->getPostActionUrl()) ?>"