Bump Newtonsoft.Json in /Projects/Backendless.NET.Standard20

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](JamesNK/Newtonsoft.Json@12.0.3...13.0.2)

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

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Author: dependabot[bot]

Projects/Backendless.NET.Standard20/Backendless.NET.Standard20.csproj

@@ -456,7 +456,7 @@
     <Compile Include="..\..\Backendless\WebORB\Writer\V3ReferenceCache.cs" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="System.Collections.Immutable" Version="1.5.0" />
     <PackageReference Include="SocketIOClient" Version="3.0.7" />
   </ItemGroup>