Bump Newtonsoft.Json in /AsyncIntro/Code/AsyncHttpService
Bump Newtonsoft.Json in /AsyncIntro/Code/AsyncHttpService

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 4.5.8 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/4.5.8...13.0.1)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
jskeet/DemoCode,jskeet/DemoCode,jskeet/DemoCode,jskeet/DemoCode