ENGCOM-8364: Updated string with Static key. #30579

 - Merge Pull Request #30579 from ejaz-alam/magento2:patch-2
 - Merged commits:
   1. 6970b19
   2. fd4a5a7

app/code/Magento/Quote/Model/Quote/Address.php

@@ -139,6 +139,8 @@ class Address extends AbstractAddress implements
     const ADDRESS_TYPE_BILLING = 'billing';
 
     const ADDRESS_TYPE_SHIPPING = 'shipping';
+
+    private const CACHED_ITEMS_ALL = 'cached_items_all';
 
     /**
      * Prefix of model events
@@ -636,8 +638,7 @@ public function getItemsCollection()
     public function getAllItems()
     {
         // We calculate item list once and cache it in three arrays - all items
-        $key = 'cached_items_all';
-        if (!$this->hasData($key)) {
+        if (!$this->hasData(self::CACHED_ITEMS_ALL)) {
             $quoteItems = $this->getQuote()->getItemsCollection();
             $addressItems = $this->getItemsCollection();
 
@@ -676,10 +677,10 @@ public function getAllItems()
             }
 
             // Cache calculated lists
-            $this->setData('cached_items_all', $items);
+            $this->setData(self::CACHED_ITEMS_ALL, $items);
         }
 
-        $items = $this->getData($key);
+        $items = $this->getData(self::CACHED_ITEMS_ALL);
 
         return $items;
     }