Merge pull request #4226 from RosarioPulella/fix/uitest-winui-version

UITests: Remove ref to incorrect version of winui

Author: michael-hawker

UITests/UITests.App/UITests.App.csproj

@@ -168,9 +168,6 @@
     <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform">
       <Version>6.2.12</Version>
     </PackageReference>
-    <PackageReference Include="Microsoft.UI.Xaml">
-      <Version>2.6.1</Version>
-    </PackageReference>
     <PackageReference Include="MUXAppTestHelpers">
       <Version>0.0.4</Version>
     </PackageReference>