Bump Newtonsoft.Json in /samples/code-samples/ChangeFeedProcessor

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 9.0.1 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/9.0.1...13.0.1)

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

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

samples/code-samples/ChangeFeedProcessor/packages.config

@@ -3,5 +3,5 @@
   <package id="Microsoft.Azure.DocumentDB" version="1.21.1" targetFramework="net461" />
   <package id="Microsoft.Azure.DocumentDB.ChangeFeedProcessor" version="1.3.2" targetFramework="net461" />
   <package id="Microsoft.CSharp" version="4.4.1" targetFramework="net461" />
-  <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net461" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net461" />
 </packages>