Update dependencies from https://github.com/dotnet/winforms build 20200714.2 (#3249)

Microsoft.Private.Winforms
 From Version 5.0.0-preview.8.20364.1 -> To Version 5.0.0-preview.8.20364.2
Co-authored-by: Ndotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

eng/Version.Details.xml

 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.Private.Winforms" Version="5.0.0-preview.8.20364.1">
+    <Dependency Name="Microsoft.Private.Winforms" Version="5.0.0-preview.8.20364.2">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>d670a81aea7f96b4310fc1e20f2dc7588e20db61</Sha>
+      <Sha>c0ef9e5e27ca40fa4ed88d6f5a9c563c778976e6</Sha>
     </Dependency>
     <Dependency Name="Microsoft.Win32.Registry" Version="5.0.0-preview.8.20363.2" CoherentParentDependency="Microsoft.Private.Winforms">
       <Uri>https://github.com/dotnet/runtime</Uri>

eng/Versions.props

@@ -9,7 +9,7 @@
   </PropertyGroup>
   <!-- NuGet Package Versions -->
   <PropertyGroup>
-    <MicrosoftPrivateWinformsVersion>5.0.0-preview.8.20364.1</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>5.0.0-preview.8.20364.2</MicrosoftPrivateWinformsVersion>
   </PropertyGroup>
   <!-- Packages that come from https://github.com/dotnet/coreclr -->
   <PropertyGroup>