Fix stale namespace in NodeDirectiveDBTest

The resolver reference still pointed to the pre-2021 namespace
Tests\Integration\Schema, causing schema building to fail with
webonyx/graphql-php v15.31.x which validates resolver classes eagerly.

🤖 Generated with Claude Code

Author: spawnia

tests/Integration/GlobalId/NodeDirectiveDBTest.php

@@ -133,7 +133,7 @@ public function testUnknownNodeType(): void
     public function testTypeWithoutNodeDirective(): void
     {
         $this->schema .= /** @lang GraphQL */ <<<'GRAPHQL'
-        type User @node(resolver: "Tests\\Integration\\Schema\\NodeDirectiveDBTest@resolveNode") {
+        type User @node(resolver: "Tests\\Integration\\GlobalId\\NodeDirectiveDBTest@resolveNode") {
             name: String!
         }