Add depency with module-directory and add better method to get is zip code is optional

Author: osrecio

app/code/Magento/CustomerGraphQl/Model/Customer/Address/CreateCustomerAddress.php

@@ -111,7 +111,7 @@ public function validateData(array $addressData): void
         $errorInput = [];
 
         //Add error for empty postcode with country with no optional ZIP
-        if (!in_array($addressData['country_id'], $this->directoryData->getCountriesWithOptionalZip())
+        if (!$this->directoryData->isZipCodeOptional($addressData['country_id'])
             && (!isset($addressData['postcode']) || empty($addressData['postcode']))
         ) {
             $errorInput[] = 'postcode';

app/code/Magento/CustomerGraphQl/composer.json

@@ -4,15 +4,15 @@
   "type": "magento2-module",
   "require": {
     "php": "~7.1.3||~7.2.0||~7.3.0",
-    "magento/module-customer": "*",
     "magento/module-authorization": "*",
     "magento/module-customer": "*",
     "magento/module-eav": "*",
     "magento/module-graph-ql": "*",
     "magento/module-newsletter": "*",
     "magento/module-integration": "*",
     "magento/module-store": "*",
-    "magento/framework": "*"
+    "magento/framework": "*",
+    "magento/module-directory": "*"
   },
   "license": [
     "OSL-3.0",