Bump Newtonsoft.Json from 10.0.1 to 13.0.1 in /sample/AppConfigDemo

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 10.0.1 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@10.0.1...13.0.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

sample/AppConfigDemo/packages.config

@@ -10,7 +10,7 @@
   <package id="Microsoft.IdentityModel.Protocols" version="5.5.0" targetFramework="net461" />
   <package id="Microsoft.IdentityModel.Protocols.OpenIdConnect" version="5.5.0" targetFramework="net461" />
   <package id="Microsoft.IdentityModel.Tokens" version="5.5.0" targetFramework="net461" />
-  <package id="Newtonsoft.Json" version="10.0.1" targetFramework="net461" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net461" />
   <package id="Serilog" version="2.9.0" targetFramework="net461" />
   <package id="Serilog.Settings.AppSettings" version="2.2.2" targetFramework="net461" />
   <package id="System.Buffers" version="4.5.1" targetFramework="net461" />