Bump Newtonsoft.Json in /Okta.Xamarin/Tests/Okta.Xamarin.UITest.iOS

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 12.0.3 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@12.0.3...13.0.1)

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

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

Okta.Xamarin/Tests/Okta.Xamarin.UITest.iOS/Okta.Xamarin.UITest.iOS.csproj

@@ -29,7 +29,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json">
-      <Version>12.0.3</Version>
+      <Version>13.0.1</Version>
     </PackageReference>
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="System.Runtime.InteropServices.RuntimeInformation">