ACP2E-3255: [GRAPHQL] model value should be specified when getting customerCart

 - Fixed the static test failure.

Author: devarul

app/code/Magento/QuoteGraphQl/Plugin/Model/Cart/CustomerEmptyCartResolver.php

@@ -47,7 +47,7 @@ public function __construct(
      * @param CustomerCartResolver $subject
      * @param Closure $proceed
      * @param int $customerId
-     * @param null $predefinedMaskedQuoteId
+     * @param string|null $predefinedMaskedQuoteId
      * @return Quote
      * @throws NoSuchEntityException
      * @throws LocalizedException
@@ -80,7 +80,7 @@ public function aroundResolve(
      * Create masked id for customer's active quote if it's not exists
      *
      * @param int $quoteId
-     * @param null $predefinedMaskedQuoteId
+     * @param string|null $predefinedMaskedQuoteId
      * @return void
      * @throws AlreadyExistsException
      */