Bumped all Toolkit packages to latest from CI

Author: Sergio0694

samples/MvvmSampleUwp/MvvmSampleUwp/MvvmSampleUwp.csproj

@@ -263,13 +263,16 @@
       <Version>6.2.10</Version>
     </PackageReference>
     <PackageReference Include="Microsoft.Toolkit">
-      <Version>7.0.0-preview3</Version>
+      <Version>7.0.0-build.486</Version>
     </PackageReference>
     <PackageReference Include="Microsoft.Toolkit.Mvvm">
       <Version>7.0.0-build.486</Version>
     </PackageReference>
     <PackageReference Include="Microsoft.Toolkit.Uwp.UI.Controls">
-      <Version>7.0.0-preview2</Version>
+      <Version>7.0.0-build.486</Version>
+    </PackageReference>
+    <PackageReference Include="Microsoft.Toolkit.Uwp.UI.Controls.Markdown">
+      <Version>7.0.0-build.486</Version>
     </PackageReference>
     <PackageReference Include="Microsoft.UI.Xaml">
       <Version>2.4.2</Version>