AdvancedServerList

This update fixes an issue, where the hover did not work when using the plugin on a 1.21 Paper Server. The reason was breaking changes within Paper's code (Which afaik go even back to the latest 1.20.6 builds) that made AdvancedServerList's way of updating the hover no longer functional.

I've implemented a fix for this now. The plugin should also still work on older Server versions, but I want to emphasize that I do not guarantee this and should this old API be removed in the future, will I not implement a hacky backwards aproach but instead simply remove this old code. With that said will I still try to fix smaller issues with this hover, if they are within my skillset to do so.