chore(deps): bump Newtonsoft.Json, NUnit and Xamarin.UITest

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json), [NUnit](https://github.com/nunit/nunit) and Xamarin.UITest. These dependencies needed to be updated together.

Updates `Newtonsoft.Json` from 13.0.3 to 13.0.3
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@13.0.3...13.0.3)

Updates `NUnit` from 4.2.2 to 3.14.0
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/v3.14.0/CHANGES.md)
- [Commits](nunit/nunit@4.2.2...v3.14.0)

Updates `Xamarin.UITest` from 4.4.1 to 4.4.2

---
updated-dependencies:
- dependency-name: Newtonsoft.Json
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: NUnit
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: Xamarin.UITest
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Directory.Packages.props

@@ -33,6 +33,6 @@
     <PackageVersion Include="Uno.Toolkit.WinUI.Markup" Version="6.3.6" />
     <PackageVersion Include="Uno.UITest.Helpers" Version="1.1.0-dev.70" />
     <PackageVersion Include="Uno.WinUI" Version="5.5.66" />
-    <PackageVersion Include="Xamarin.UITest" Version="4.4.1" />
+    <PackageVersion Include="Xamarin.UITest" Version="4.4.2" />
   </ItemGroup>
 </Project>