NPA-5191: Update Postman URL

Author: LeoKHoward

specification/validated-relationships-service-api.yaml

@@ -141,7 +141,7 @@ info:
     * only covers a limited set of scenarios
     * is open access, so does not allow you to test authorisation
 
-    [<img src="https://run.pstmn.io/button.svg" alt="Run In Postman" style="width: 128px; height: 32px;">](https://app.getpostman.com/run-collection/45653607-8a3d3121-ca56-4ac8-9d14-cd375ee158fc?action=collection%2Ffork&source=rip_markdown&collection-url=entityId%3D45653607-8a3d3121-ca56-4ac8-9d14-cd375ee158fc%26entityType%3Dcollection%26workspaceId%3Db7b0feaf-e9be-4780-8e09-d82c6f42138c)
+    [<img src="https://run.pstmn.io/button.svg" alt="Run In Postman" style="width: 128px; height: 32px;">](https://god.gw.postman.com/run-collection/46399153-5d8500b1-1bed-4494-9d55-ed8487f2898a?action=collection%2Ffork&source=rip_markdown&collection-url=entityId%3D46399153-5d8500b1-1bed-4494-9d55-ed8487f2898a%26entityType%3Dcollection%26workspaceId%3Da3cfae72-2c53-419e-8850-13c2b51db16d)
 
     ### Integration testing