[master] Update dependencies from dotnet/winforms (#2796)

* Update dependencies from https://github.com/dotnet/winforms build 20200320.1

- Microsoft.Private.Winforms - 5.0.0-preview.3.20170.1

* Update dependencies from https://github.com/dotnet/winforms build 20200321.1

- Microsoft.Private.Winforms - 5.0.0-preview.3.20171.1
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.3.20169.4">
+    <Dependency Name="Microsoft.Private.Winforms" Version="5.0.0-preview.3.20171.1">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>67f4ee6f5e1b422e3edf470c5f18481246b22bbc</Sha>
+      <Sha>8138af18dd43f99c98428c996960b7d3d5377d05</Sha>
     </Dependency>
   </ProductDependencies>
   <ToolsetDependencies>

eng/Versions.props

@@ -9,7 +9,7 @@
   </PropertyGroup>
   <!-- NuGet Package Versions -->
   <PropertyGroup>
-    <MicrosoftPrivateWinformsVersion>5.0.0-preview.3.20169.4</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>5.0.0-preview.3.20171.1</MicrosoftPrivateWinformsVersion>
   </PropertyGroup>
   <!-- Packages that come from https://github.com/dotnet/coreclr -->
   <PropertyGroup>