Update dependencies from...

Update dependencies from https://dev.azure.com/dnceng/internal/_git/dotnet-wpf-int build 20190619.20 (#1032)

- Microsoft.DotNet.Wpf.DncEng - 4.8.0-preview7.19319.20

eng/Version.Details.xml

@@ -75,9 +75,9 @@
       <Uri>https://github.com/dotnet/corefx</Uri>
       <Sha>5ec88f81af71d253cfa74f9982abf748ccbd529b</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.Wpf.DncEng" Version="4.8.0-preview7.19319.10">
+    <Dependency Name="Microsoft.DotNet.Wpf.DncEng" Version="4.8.0-preview7.19319.20">
       <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-wpf-int</Uri>
-      <Sha>c23845323d09d6b16267b77a97e197fb70048794</Sha>
+      <Sha>e73e4011317cfb89dca5a3baf8f97e8185743191</Sha>
     </Dependency>
     <Dependency Name="System.IO.Packaging" Version="4.6.0-preview7.19319.8" CoherentParentDependency="Microsoft.NETCore.App">
       <Uri>https://github.com/dotnet/corefx</Uri>

eng/Versions.props

@@ -106,6 +106,6 @@
       It is worth reiterating that this package *should not* be consumed to build the product.
   -->
   <PropertyGroup>
-    <MicrosoftDotNetWpfDncEngVersion>4.8.0-preview7.19319.10</MicrosoftDotNetWpfDncEngVersion>
+    <MicrosoftDotNetWpfDncEngVersion>4.8.0-preview7.19319.20</MicrosoftDotNetWpfDncEngVersion>
   </PropertyGroup>
 </Project>