Update dependencies from https://github.com/dotnet/winforms build 20200715.10 (#3262)

Microsoft.Private.Winforms
 From Version 5.0.0-rc.1.20365.6 -> To Version 5.0.0-rc.1.20365.10
Co-authored-by: Ndotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

eng/Version.Details.xml

 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.Private.Winforms" Version="5.0.0-rc.1.20365.6">
+    <Dependency Name="Microsoft.Private.Winforms" Version="5.0.0-rc.1.20365.10">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>7c50fcf436bba8f806fdb6b016589509437f2665</Sha>
+      <Sha>8bb2e169c16d61847f0e5ccd54431625166de353</Sha>
     </Dependency>
     <Dependency Name="Microsoft.Win32.Registry" Version="5.0.0-preview.8.20363.2" CoherentParentDependency="Microsoft.Private.Winforms">
       <Uri>https://github.com/dotnet/runtime</Uri>

eng/Versions.props

@@ -9,7 +9,7 @@
   </PropertyGroup>
   <!-- NuGet Package Versions -->
   <PropertyGroup>
-    <MicrosoftPrivateWinformsVersion>5.0.0-rc.1.20365.6</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>5.0.0-rc.1.20365.10</MicrosoftPrivateWinformsVersion>
   </PropertyGroup>
   <!-- Packages that come from https://github.com/dotnet/coreclr -->
   <PropertyGroup>