Bump Newtonsoft.Json in /csharp/Adapter/Microsoft.Spark.CSharp

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 7.0.1 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/7.0.1...13.0.1)

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

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

csharp/Adapter/Microsoft.Spark.CSharp/Adapter.csproj

@@ -43,8 +43,9 @@
     <Reference Include="log4net">
       <HintPath>..\..\packages\log4net.2.0.5\lib\net45-full\log4net.dll</HintPath>
     </Reference>
-    <Reference Include="Newtonsoft.Json">
-      <HintPath>..\..\packages\Newtonsoft.Json.7.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
+    <Reference Include="Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed">
+      <HintPath>..\..\packages\Newtonsoft.Json.13.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
+      <Private>True</Private>
     </Reference>
     <Reference Include="Razorvine.Pyrolite">
       <HintPath>..\..\packages\Razorvine.Pyrolite.4.10.0.0\lib\net40\Razorvine.Pyrolite.dll</HintPath>

csharp/Adapter/Microsoft.Spark.CSharp/packages.config

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="log4net" version="2.0.5" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net45" />
   <package id="Razorvine.Pyrolite" version="4.10.0" targetFramework="net45" />
   <package id="Razorvine.Serpent" version="1.12.0" targetFramework="net45" />
-</packages>
+</packages>