Update dependencies from https://github.com/dotnet/winforms build 20190422.16

- Microsoft.Private.Winforms - 4.8.0-preview5.19222.16

Author: dotnet-maestro

eng/Version.Details.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.Private.Winforms" Version="4.8.0-preview5.19222.14">
+    <Dependency Name="Microsoft.Private.Winforms" Version="4.8.0-preview5.19222.16">
       <Uri>https://github.com/dotnet/winforms</Uri>
       <Sha>ac5d565f7a9b42c9031a45bfd4a96f1bae0a5aa5</Sha>
     </Dependency>

eng/Versions.props

@@ -5,7 +5,7 @@
     <PreReleaseVersionLabel>preview5</PreReleaseVersionLabel>
     <AssemblyVersion>4.0.0.0</AssemblyVersion>
     <SystemReflectionMetadataLoadContextVersion>4.6.0-preview4.19212.13</SystemReflectionMetadataLoadContextVersion>
-    <MicrosoftPrivateWinformsVersion>4.8.0-preview5.19222.14</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>4.8.0-preview5.19222.16</MicrosoftPrivateWinformsVersion>
     <SystemDrawingCommonVersion>4.6.0-preview4.19212.13</SystemDrawingCommonVersion>
     <SystemDirectoryServicesVersion>4.6.0-preview4.19212.13</SystemDirectoryServicesVersion>
   </PropertyGroup>