Update dependencies from https://github.com/dotnet/wpf build 20200526.4 (#806)

Microsoft.DotNet.Wpf.GitHub
 From Version 5.0.0-preview.5.20276.3 -> To Version 5.0.0-preview.5.20276.4

Dependency coherency updates

Microsoft.Private.Winforms
 From Version 5.0.0-preview.5.20271.5 -> To Version 5.0.0-preview.5.20276.2 (parent: Microsoft.DotNet.Wpf.GitHub

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

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -122,13 +122,13 @@
       <Uri>https://github.com/dotnet/coreclr</Uri>
       <Sha>d5bb8bf2437d447750cf0203dd55bb5160ff36b8</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Private.Winforms" Version="5.0.0-preview.5.20271.5" CoherentParentDependency="Microsoft.DotNet.Wpf.GitHub">
+    <Dependency Name="Microsoft.Private.Winforms" Version="5.0.0-preview.5.20276.2" CoherentParentDependency="Microsoft.DotNet.Wpf.GitHub">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>6333d3201ee61d781d5b597d44d1e0f7fccc02c9</Sha>
+      <Sha>fa784dc3ff470a16fb8cfe72de5859488366b9f6</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.Wpf.GitHub" Version="5.0.0-preview.5.20276.3">
+    <Dependency Name="Microsoft.DotNet.Wpf.GitHub" Version="5.0.0-preview.5.20276.4">
       <Uri>https://github.com/dotnet/wpf</Uri>
-      <Sha>ad99a85204e01d5e2713b76929d245ac12dd3c9c</Sha>
+      <Sha>b11a860a9beaa235ec30ab1383523171a604eec5</Sha>
     </Dependency>
     <Dependency Name="Microsoft.NETCore.App.Ref" Version="5.0.0-preview.5.20268.11" CoherentParentDependency="Microsoft.Private.Winforms">
       <Uri>https://github.com/dotnet/runtime</Uri>

eng/Versions.props

@@ -82,9 +82,9 @@
     <!-- coreclr -->
     <MicrosoftNETCoreRuntimeCoreCLRVersion>5.0.0-alpha1.19562.1</MicrosoftNETCoreRuntimeCoreCLRVersion>
     <!-- winforms -->
-    <MicrosoftPrivateWinformsVersion>5.0.0-preview.5.20271.5</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>5.0.0-preview.5.20276.2</MicrosoftPrivateWinformsVersion>
     <!-- wpf -->
-    <MicrosoftDotNetWpfGitHubVersion>5.0.0-preview.5.20276.3</MicrosoftDotNetWpfGitHubVersion>
+    <MicrosoftDotNetWpfGitHubVersion>5.0.0-preview.5.20276.4</MicrosoftDotNetWpfGitHubVersion>
     <!-- Not auto-updated. -->
     <MicrosoftBuildVersion>15.7.179</MicrosoftBuildVersion>
     <MicrosoftBuildFrameworkVersion>$(MicrosoftBuildVersion)</MicrosoftBuildFrameworkVersion>