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added scope for the const variable.

Co-authored-by: Ihor Sviziev <ihor-sviziev@users.noreply.github.com>

Author: ejaz-alam

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

@@ -140,7 +140,7 @@ class Address extends AbstractAddress implements
 
     const ADDRESS_TYPE_SHIPPING = 'shipping';
 
-    const CACHED_ITEMS_ALL = 'cached_items_all';
+    private const CACHED_ITEMS_ALL = 'cached_items_all';
 
     /**
      * Prefix of model events