Bump Newtonsoft.Json in /Projects/Backendless.NET.Framework4.7.1

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 11.0.2 to 13.0.2.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@11.0.2...13.0.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Projects/Backendless.NET.Framework4.7.1/packages.config

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="EngineIoClientDotNet" version="1.0.2-beta1" targetFramework="net471" />
-  <package id="Newtonsoft.Json" version="11.0.2" targetFramework="net471" />
+  <package id="Newtonsoft.Json" version="13.0.2" targetFramework="net471" />
   <package id="SocketIoClientDotNet" version="1.0.2-beta1" targetFramework="net471" />
   <package id="SuperSocket.ClientEngine.Core" version="0.8.0.12" targetFramework="net471" />
   <package id="System.Collections.Immutable" version="1.5.0" targetFramework="net471" />