Update dependencies from https://dev.azure.com/dnceng/internal/_git/dotnet-wpf-int build 20190626.21 (#1107)

- Microsoft.DotNet.Wpf.DncEng - 4.8.0-preview7.19326.21

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -75,9 +75,9 @@
       <Uri>https://github.com/dotnet/corefx</Uri>
       <Sha>468355e66daf9eaeb1978703fa6365cd1e37e644</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.Wpf.DncEng" Version="4.8.0-preview7.19325.4">
+    <Dependency Name="Microsoft.DotNet.Wpf.DncEng" Version="4.8.0-preview7.19326.21">
       <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-wpf-int</Uri>
-      <Sha>914f5f71a797720a04c0808e4dd3e50b1fb2f4b6</Sha>
+      <Sha>120e86951727331e5b899ed8b5b3b4ac35764b42</Sha>
     </Dependency>
     <Dependency Name="System.IO.Packaging" Version="4.6.0-preview7.19320.1" CoherentParentDependency="Microsoft.NETCore.App">
       <Uri>https://github.com/dotnet/corefx</Uri>

eng/Versions.props

@@ -107,6 +107,6 @@
       It is worth reiterating that this package *should not* be consumed to build the product.
   -->
   <PropertyGroup>
-    <MicrosoftDotNetWpfDncEngVersion>4.8.0-preview7.19325.4</MicrosoftDotNetWpfDncEngVersion>
+    <MicrosoftDotNetWpfDncEngVersion>4.8.0-preview7.19326.21</MicrosoftDotNetWpfDncEngVersion>
   </PropertyGroup>
 </Project>