Core - Update CefSettingsBase.ProductVersion
Core - Update CefSettingsBase.ProductVersion

Change to use the user_agent_product property, as this is a breaking change and the `90-pre` release has already happened
wait we won't rename the property until version 91

https://bitbucket.org/chromiumembedded/cef/commits/02ae4597d8b6c895e46891a7596cf5fa1fe15df8#Linclude/internal/cef_types.hT309

Issue #3530

Livit/CefSharp,Livit/CefSharp,Livit/CefSharp,Livit/CefSharp