Update dependencies from https://github.com/dotnet/winforms build 20211221.5 (#5862)

[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.1.21621.4">
+    <Dependency Name="Microsoft.Private.Winforms" Version="7.0.0-alpha.1.21621.5">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>ae505c58f63e176f0b90d418562ec89ed052de35</Sha>
+      <Sha>b2f12fddc038c8e04717f895a63aae72778b0a28</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Dotnet.WinForms.ProjectTemplates" Version="7.0.0-alpha.1.21621.4">
+    <Dependency Name="Microsoft.Dotnet.WinForms.ProjectTemplates" Version="7.0.0-alpha.1.21621.5">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>ae505c58f63e176f0b90d418562ec89ed052de35</Sha>
+      <Sha>b2f12fddc038c8e04717f895a63aae72778b0a28</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.1.21621.4</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>7.0.0-alpha.1.21621.5</MicrosoftPrivateWinformsVersion>
   </PropertyGroup>
   <!-- Packages that come from https://github.com/dotnet/coreclr -->
   <PropertyGroup>