build(deps): bump Newtonsoft.Json

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 10.0.2 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/10.0.2...13.0.1)

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

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

src/managed/OpenLiveWriter.PostEditor/packages.config

@@ -10,7 +10,7 @@
   <package id="Microsoft.Bcl.Build" version="1.0.21" targetFramework="net461" />
   <package id="Microsoft.Net.Http" version="2.2.29" targetFramework="net461" />
   <package id="Mono.Cecil" version="0.9.6.4" targetFramework="net461" />
-  <package id="Newtonsoft.Json" version="10.0.2" targetFramework="net461" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net461" />
   <package id="Splat" version="2.0.0" targetFramework="net461" />
   <package id="squirrel.windows" version="1.4.4" targetFramework="net461" />
   <package id="Zlib.Portable.Signed" version="1.11.0" targetFramework="net461" />