fix 8.0 branding (#5363)

Author: HongGit

eng/Versions.props

@@ -3,7 +3,7 @@
   <!-- Versioning specifications:  https://github.com/dotnet/arcade/blob/master/Documentation/CorePackages/Versioning.md -->
   <PropertyGroup>
     <ProductVersion>8.0.0</ProductVersion>
-    <MajorVersion>0</MajorVersion>
+    <MajorVersion>8</MajorVersion>
     <MinorVersion>0</MinorVersion>
     <WcfAssemblyVersion>8.0.0.0</WcfAssemblyVersion>
     <!-- To produce shipping versions in non-official builds, instead of default fixed dummy version number (42.42.42.42). -->