fix(GraphQL Node): Fix request format JSON error (#8646)

packages/nodes-base/nodes/GraphQL/test/workflow.json

@@ -0,0 +1,42 @@
+{
+	"meta": {
+		"templateCredsSetupCompleted": true,
+		"instanceId": "104a4d08d8897b8bdeb38aaca515021075e0bd8544c983c2bb8c86e6a8e6081c"
+	},
+	"nodes": [
+		{
+			"parameters": {},
+			"id": "fb826323-2e48-4f11-bb0e-e12de32e22ee",
+			"name": "When clicking \"Test workflow\"",
+			"type": "n8n-nodes-base.manualTrigger",
+			"typeVersion": 1,
+			"position": [180, 160]
+		},
+		{
+			"parameters": {
+				"endpoint": "https://api.n8n.io/graphql",
+				"requestFormat": "json",
+				"query": "query {\n  nodes(pagination: { limit: 1 }) {\n    data {\n      id\n      attributes {\n        name\n        displayName\n        description\n        group\n        codex\n        createdAt\n      }\n    }\n  }\n}"
+			},
+			"name": "Fetch Request Format JSON",
+			"type": "n8n-nodes-base.graphql",
+			"typeVersion": 1,
+			"position": [420, 160],
+			"id": "7f8ceaf4-b82f-48d5-be0b-9fe3bfb35ee4"
+		}
+	],
+	"connections": {
+		"When clicking \"Test workflow\"": {
+			"main": [
+				[
+					{
+						"node": "Fetch Request Format JSON",
+						"type": "main",
+						"index": 0
+					}
+				]
+			]
+		}
+	},
+	"pinData": {}
+}