GHSA-85JM-CWP2-MVPV CefSharp.Common: `FolderSchemeHandlerFactory` path boundary check can expose files outside the configured root folder

Summary FolderSchemeHandlerFactory was intended to restrict served files to a configured rootFolder, but its path validation used a raw string prefix check. A request could escape to a sibling directory whose full path starts with the root folder path, allowing files outside the configured root t...