Bump Newtonsoft.Json from 12.0.3 to 13.0.2 in /Windows/sample-app

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 12.0.3 to 13.0.2.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/12.0.3...13.0.2)

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

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

Windows/sample-app/GraphNotificationsSample.csproj

@@ -166,7 +166,7 @@
       <Version>6.2.9</Version>
     </PackageReference>
     <PackageReference Include="Newtonsoft.Json">
-      <Version>12.0.3</Version>
+      <Version>13.0.2</Version>
     </PackageReference>
   </ItemGroup>
   <PropertyGroup Condition=" '$(VisualStudioVersion)' == '' or '$(VisualStudioVersion)' &lt; '14.0' ">