Bump Newtonsoft.Json from 8.0.3 to 13.0.1 in /DataPages/iOS

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 8.0.3 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/8.0.3...13.0.1)

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

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

DataPages/iOS/packages.config

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="modernhttpclient" version="2.4.2" targetFramework="xamarinios10" />
-  <package id="Newtonsoft.Json" version="8.0.3" targetFramework="xamarinios10" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="xamarinios10" />
   <package id="Xamarin.Forms" version="2.3.0.38-pre2" targetFramework="xamarinios10" />
   <package id="Xamarin.Forms.Pages" version="2.3.0.38-pre2" targetFramework="xamarinios10" />
   <package id="Xamarin.Forms.Theme.Base" version="1.0.0.43-pre1" targetFramework="xamarinios10" />