We should use the new JsonUtils.ParseJsonObject method as the old one…

… is obsolete

src/Skybrud.Umbraco.GridData/ValueConverters/GridValueConverter.cs

@@ -1,6 +1,6 @@
 using System;
 using Newtonsoft.Json.Linq;
-using Skybrud.Essentials.Json;
+using Skybrud.Essentials.Json.Newtonsoft;
 using Skybrud.Umbraco.GridData.Factories;
 using Skybrud.Umbraco.GridData.Models;
 using Umbraco.Cms.Core.Models.PublishedContent;