Updated WinUI (#7822)

Author: yaira2

src/Files/Files.csproj

@@ -1551,7 +1551,7 @@
       <Version>7.1.2</Version>
     </PackageReference>
     <PackageReference Include="Microsoft.UI.Xaml">
-      <Version>2.7.1-prerelease.211026002</Version>
+      <Version>2.8.0-prerelease.220118001</Version>
     </PackageReference>
     <PackageReference Include="Microsoft.Xaml.Behaviors.Uwp.Managed">
       <Version>2.0.1</Version>
@@ -1642,4 +1642,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>