Bump Newtonsoft.Json in /AppService/samples/GraphNotificationsUsingUnsId

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 11.0.1 to 13.0.2.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/11.0.1...13.0.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

AppService/samples/GraphNotificationsUsingUnsId/packages.config

@@ -5,5 +5,5 @@
   <package id="Microsoft.AspNet.WebApi.Core" version="5.2.4" targetFramework="net472" />
   <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.4" targetFramework="net472" />
   <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.0" targetFramework="net472" />
-  <package id="Newtonsoft.Json" version="11.0.1" targetFramework="net472" />
+  <package id="Newtonsoft.Json" version="13.0.2" targetFramework="net472" />
 </packages>