Update dependencies from https://github.com/dotnet/winforms build 20200811.4 (#3326)

[release/3.1] Update dependencies from dotnet/winforms
- Updates:
  - Microsoft.Private.Winforms: from 4.8.1-servicing.20308.4 to 4.8.1-servicing.20411.4

Author: dotnet-maestro[bot]

NuGet.config

@@ -3,10 +3,6 @@
 <configuration>
   <packageSources>
     <clear />
-    <!--Begin: Package sources managed by Dependency Flow automation. Do not edit the sources below.-->
-    <add key="darc-pub-dotnet-core-setup-2d163b8" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-core-setup-2d163b87/nuget/v3/index.json" />
-    <add key="darc-pub-dotnet-corefx-e946ceb-1" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-corefx-e946cebe-1/nuget/v3/index.json" />
-    <!--End: Package sources managed by Dependency Flow automation. Do not edit the sources above.-->
     <add key="myget-fxlab" value="https://dotnet.myget.org/F/dotnet-corefxlab/api/v3/index.json" />
     <add key="arcade" value="https://dotnetfeed.blob.core.windows.net/dotnet-tools-internal/index.json" />
     <add key="dotnet-core" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />

eng/Version.Details.xml

@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.Private.Winforms" Version="4.8.1-servicing.20308.4">
+    <Dependency Name="Microsoft.Private.Winforms" Version="4.8.1-servicing.20411.4">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>de3ff8ae63a8109c1fba47c4b2fa71b35a423739</Sha>
+      <Sha>96f8bef5b7856c14407744fb9fe3fc81d61e8e67</Sha>
     </Dependency>
   </ProductDependencies>
   <ToolsetDependencies>

eng/Versions.props

@@ -18,7 +18,7 @@
   </PropertyGroup>
   <!-- NuGet Package Versions -->
   <PropertyGroup>
-    <MicrosoftPrivateWinformsVersion>4.8.1-servicing.20308.4</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>4.8.1-servicing.20411.4</MicrosoftPrivateWinformsVersion>
   </PropertyGroup>
   <!-- Packages that come from https://github.com/dotnet/coreclr -->
   <PropertyGroup>