Adjusted option values according to the latest changes

Author: rogyar

app/code/Magento/QuoteGraphQl/Model/Cart/UpdateCartItem.php

@@ -47,7 +47,7 @@ public function execute(Quote $cart, int $cartItemId, float $qty, array $customi
     {
         $customizableOptions = [];
         foreach ($customizableOptionsData as $customizableOption) {
-            $customizableOptions[$customizableOption['id']] = $customizableOption['value'];
+            $customizableOptions[$customizableOption['id']] = $customizableOption['value_string'];
         }
 
         try {

dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/EditQuoteItemCustomOptionsTest.php

@@ -168,7 +168,7 @@ public function testOptionSetPersistsOnExtraOptionWithIncorrectId()
         $customOptionsValues = $this->getCustomOptionsValuesForQuery($sku);
 
         /* Add nonexistent option to the query */
-        $customOptionsValues[] = ['id' => -10, 'value' => 'value'];
+        $customOptionsValues[] = ['id' => -10, 'value_string' => 'value'];
 
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
         $customizableOptionsQuery = preg_replace('/"([^"]+)"\s*:\s*/', '$1:', json_encode($customOptionsValues));
@@ -259,13 +259,13 @@ private function getCustomOptionsValuesForQuery(string $sku): array
             if ($optionType == 'field' || $optionType == 'area') {
                 $customOptionsValues[] = [
                     'id' => (int) $customOption->getOptionId(),
-                    'value' => 'test'
+                    'value_string' => 'test'
                 ];
             } elseif ($optionType == 'drop_down') {
                 $optionSelectValues = $customOption->getValues();
                 $customOptionsValues[] = [
                     'id' => (int) $customOption->getOptionId(),
-                    'value' => reset($optionSelectValues)->getOptionTypeId()
+                    'value_string' => reset($optionSelectValues)->getOptionTypeId()
                 ];
             }
         }