jQuery 4.0 is out in beta, so I think it qualifies as "modern" in the sense that it still has active work and progress. It's not "new" if that's what you mean. I would prefer the well-understood and tested in the real world tool over something new and shiny.

You may not need jQuery because vanilla JS can do the same things now. Or you may have other tools that do what you need. But choosing something because it's new or supposedly "modern" only makes sense if the alternatives are obsolete or prevent you from doing something, and jQuery isn't either.