Update dependencies from https://github.com/dotnet/winforms build 20200305.3 (#2722)

- Microsoft.Private.Winforms - 5.0.0-preview.2.20155.3

Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.Private.Winforms" Version="5.0.0-preview.2.20155.1">
+    <Dependency Name="Microsoft.Private.Winforms" Version="5.0.0-preview.2.20155.3">
       <Uri>https://github.com/dotnet/winforms</Uri>
       <Sha>355d112ab87257a36a3348caf5669e61c6273850</Sha>
     </Dependency>

eng/Versions.props

@@ -9,7 +9,7 @@
   </PropertyGroup>
   <!-- NuGet Package Versions -->
   <PropertyGroup>
-    <MicrosoftPrivateWinformsVersion>5.0.0-preview.2.20155.1</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>5.0.0-preview.2.20155.3</MicrosoftPrivateWinformsVersion>
   </PropertyGroup>
   <!-- Packages that come from https://github.com/dotnet/coreclr -->
   <PropertyGroup>