Bump Newtonsoft.Json from 8.0.2 to 13.0.1 in /footnotes

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 8.0.2 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/8.0.2...13.0.1)

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

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

footnotes/packages.config

@@ -13,5 +13,5 @@
   <package id="Microsoft.ProjectOxford.EntityLinking" version="1.0.0.0" targetFramework="net46" />
   <package id="Microsoft.Rest.ClientRuntime" version="1.8.2" targetFramework="net46" />
   <package id="Microsoft.WindowsAzure.ConfigurationManager" version="3.1.0" targetFramework="net46" />
-  <package id="Newtonsoft.Json" version="8.0.2" targetFramework="net46" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net46" />
 </packages>