chore: keep toolkit on 5.0.19 uno

Author: kazo0

src/Directory.Packages.props

@@ -22,8 +22,8 @@
     <PackageVersion Include="Uno.WinUI.Markup" Version="5.1.0-dev.78" />
     <PackageVersion Include="Uno.Material" Version="4.1.0-dev.39" />
     <PackageVersion Include="Uno.Material.WinUI" Version="4.1.0-dev.39" />
-    <PackageVersion Include="Uno.UI" Version="5.1.0-dev.975" />
-    <PackageVersion Include="Uno.WinUI" Version="5.1.0-dev.975" />
+    <PackageVersion Include="Uno.UI" Version="5.0.19" />
+    <PackageVersion Include="Uno.WinUI" Version="5.0.19" />
     <PackageVersion Include="Uno.XamlMerge.Task" Version="1.32.0-dev.61" />
     <PackageVersion Include="FluentAssertions" Version="5.10.3" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />