Update dependencies from https://github.com/dotnet/winforms build 20190815.9 (#1645)

- Microsoft.Private.Winforms - 4.8.0-preview9.19415.9

Dependency coherency updates

- Microsoft.NETCore.App - 3.0.0-preview9-19415-10 (parent: Microsoft.Private.Winforms)

eng/Version.Details.xml

 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.Private.Winforms" Version="4.8.0-preview9.19415.8">
+    <Dependency Name="Microsoft.Private.Winforms" Version="4.8.0-preview9.19415.9">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>4dd38cea798937b19bb363c7bf338fc654f8f580</Sha>
+      <Sha>cfeb22c275521d41bc8591689d23ca15dcce678f</Sha>
     </Dependency>
   </ProductDependencies>
   <ToolsetDependencies>
@@ -59,9 +59,9 @@
       <Uri>https://github.com/dotnet/corefx</Uri>
       <Sha>b82d2bc44424c8a99a1f0fc13202bdfd43e6f9f5</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NETCore.App" Version="3.0.0-preview9-19415-09" CoherentParentDependency="Microsoft.Private.Winforms">
+    <Dependency Name="Microsoft.NETCore.App" Version="3.0.0-preview9-19415-10" CoherentParentDependency="Microsoft.Private.Winforms">
       <Uri>https://github.com/dotnet/core-setup</Uri>
-      <Sha>10f2c1b10a309047fe19a54b60e1d05aa32d8e43</Sha>
+      <Sha>a95bcfc520c8aa780d32874b6eebbbf1b4304657</Sha>
     </Dependency>
     <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="1.0.0-beta.19411.1">
       <Uri>https://github.com/dotnet/arcade</Uri>

eng/Versions.props

@@ -8,7 +8,7 @@
   </PropertyGroup>
   <!-- NuGet Package Versions -->
   <PropertyGroup>
-    <MicrosoftPrivateWinformsVersion>4.8.0-preview9.19415.8</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>4.8.0-preview9.19415.9</MicrosoftPrivateWinformsVersion>
   </PropertyGroup>
   <!-- Packages that come from https://github.com/dotnet/coreclr -->
   <PropertyGroup>
@@ -18,7 +18,7 @@
   </PropertyGroup>
   <!-- Packages that come from https://github.com/dotnet/core-setup -->
   <PropertyGroup>
-    <MicrosoftNETCoreAppVersion>3.0.0-preview9-19415-09</MicrosoftNETCoreAppVersion>
+    <MicrosoftNETCoreAppVersion>3.0.0-preview9-19415-10</MicrosoftNETCoreAppVersion>
     <MicrosoftNETCorePlatformsVersion>3.0.0-preview9.19409.17</MicrosoftNETCorePlatformsVersion>
     <SystemDrawingCommonVersion>4.6.0-preview9.19409.17</SystemDrawingCommonVersion>
     <SystemDirectoryServicesVersion>4.6.0-preview9.19409.17</SystemDirectoryServicesVersion>