Bump Newtonsoft.Json from 6.0.4 to 13.0.1 in /OpusCatMTEngine

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 6.0.4 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@6.0.4...13.0.1)

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

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

OpusCatMTEngine/packages.config

@@ -17,7 +17,7 @@
   <package id="Microsoft.Owin.Hosting" version="4.1.1" targetFramework="net472" />
   <package id="Microsoft.WindowsAPICodePack-Core" version="1.1.0.0" targetFramework="net472" />
   <package id="Microsoft.WindowsAPICodePack-Shell" version="1.1.0.0" targetFramework="net472" />
-  <package id="Newtonsoft.Json" version="6.0.4" targetFramework="net472" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net472" />
   <package id="Octokit" version="0.51.0" targetFramework="net472" />
   <package id="Owin" version="1.0" targetFramework="net472" />
   <package id="pythonnet_netstandard_py38_win" version="2.5.2" targetFramework="net472" />