Bump Newtonsoft.Json in /samples/Basic/Web/SkiaSharpSample (#2131)

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 12.0.2 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/12.0.2...13.0.1)

---
updated-dependencies:
- dependency-name: Newtonsoft.Json
  dependency-type: direct:production
...

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samples/Basic/Web/SkiaSharpSample/packages.config

@@ -16,6 +16,6 @@
   <package id="Microsoft.jQuery.Unobtrusive.Validation" version="3.2.11" targetFramework="net472" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net472" />
   <package id="Modernizr" version="2.8.3" targetFramework="net472" />
-  <package id="Newtonsoft.Json" version="12.0.2" targetFramework="net472" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net472" />
   <package id="WebGrease" version="1.6.0" targetFramework="net472" />
 </packages>