updated NewtonSoft depdency version to fix security issue

Author: HugoMario

src/main/resources/handlebars/csharp/nuspec.mustache

@@ -30,7 +30,7 @@
         <!-- Dependencies are automatically installed when the package is installed -->
         <dependencies>
 
-            <dependency id="NewtonSoft.Json" version="10.0.3" />
+            <dependency id="NewtonSoft.Json" version="13.0.1" />
             <dependency id="JsonSubTypes" version="1.2.0" />
             <dependency id="RestSharp" version="105.1.0" />
             {{#generatePropertyChanged}}