Update dependencies from https://github.com/dotnet/winforms build 20200622.1

Microsoft.Private.Winforms
 From Version 5.0.0-preview.7.20311.7 -> To Version 5.0.0-preview.7.20322.1

eng/Version.Details.xml

 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.Private.Winforms" Version="5.0.0-preview.7.20322.2">
+    <Dependency Name="Microsoft.Private.Winforms" Version="5.0.0-preview.7.20322.1">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>581525b1a091219f595672b24e1dde7925fd4f5f</Sha>
+      <Sha>a8df5ec88f104048ce9c1c6279f4bb3207d69057</Sha>
     </Dependency>
   </ProductDependencies>
   <ToolsetDependencies>

eng/Versions.props

@@ -9,7 +9,7 @@
   </PropertyGroup>
   <!-- NuGet Package Versions -->
   <PropertyGroup>
-    <MicrosoftPrivateWinformsVersion>5.0.0-preview.7.20322.2</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>5.0.0-preview.7.20322.1</MicrosoftPrivateWinformsVersion>
   </PropertyGroup>
   <!-- Packages that come from https://github.com/dotnet/coreclr -->
   <PropertyGroup>