Update dependencies from https://github.com/dotnet/winforms build 20190831.2 (#1759)

- Microsoft.Private.Winforms - 4.8.0-rc1.19431.2

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.Private.Winforms" Version="4.8.0-rc1.19430.7">
+    <Dependency Name="Microsoft.Private.Winforms" Version="4.8.0-rc1.19431.2">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>49f00cea3d7c4290a446795de2af9bd9073615aa</Sha>
+      <Sha>8724b81dad3790a8e0ef54fd0cf448fc88d8cf8f</Sha>
     </Dependency>
   </ProductDependencies>
   <ToolsetDependencies>

eng/Versions.props

@@ -8,7 +8,7 @@
   </PropertyGroup>
   <!-- NuGet Package Versions -->
   <PropertyGroup>
-    <MicrosoftPrivateWinformsVersion>4.8.0-rc1.19430.7</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>4.8.0-rc1.19431.2</MicrosoftPrivateWinformsVersion>
   </PropertyGroup>
   <!-- Packages that come from https://github.com/dotnet/coreclr -->
   <PropertyGroup>