2.13.3

Fixed

• Find threw TypeLoadException with AngleSharp 1.8.6 because HtmlSelectElementWrapper did not implement the new SelectedIndex setter. Reported by @poxet in #1957. Fixed by @linkdotnet.
• A WaitFor* call whose first check passed left its timeout timer running, which kept the helper, the renderer and everything the renderer holds alive until the timeout elapsed. With a long DefaultWaitTimeout, a test suite could hold every rendered component in memory for its whole run. Fixed by @xaviergxf.