[main] Update dependencies from dotnet/winforms (#5800)

[main] Update dependencies from dotnet/winforms

eng/Version.Details.xml

 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.Private.Winforms" Version="7.0.0-alpha.1.21608.6">
+    <Dependency Name="Microsoft.Private.Winforms" Version="7.0.0-alpha.1.21608.8">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>65f932720b8060f293c65e522bdebd8c4535b5df</Sha>
+      <Sha>8ea3dfb805969d66fc0d96b5911c8a2d797d99f1</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Dotnet.WinForms.ProjectTemplates" Version="7.0.0-alpha.1.21608.6">
+    <Dependency Name="Microsoft.Dotnet.WinForms.ProjectTemplates" Version="7.0.0-alpha.1.21608.8">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>65f932720b8060f293c65e522bdebd8c4535b5df</Sha>
+      <Sha>8ea3dfb805969d66fc0d96b5911c8a2d797d99f1</Sha>
     </Dependency>
     <Dependency Name="System.CodeDom" Version="7.0.0-alpha.1.21606.7" CoherentParentDependency="Microsoft.Private.Winforms">
       <Uri>https://github.com/dotnet/runtime</Uri>

eng/Versions.props

@@ -9,7 +9,7 @@
   </PropertyGroup>
   <!-- NuGet Package Versions -->
   <PropertyGroup>
-    <MicrosoftPrivateWinformsVersion>7.0.0-alpha.1.21608.6</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>7.0.0-alpha.1.21608.8</MicrosoftPrivateWinformsVersion>
   </PropertyGroup>
   <!-- Packages that come from https://github.com/dotnet/coreclr -->
   <PropertyGroup>