Bootstrap 5 removed the dependency on jQuery.
You don’t need jQuery to use Bootstrap any more, and Bootstrap no longer provides instructions on including it (because there’s no need).
If you want to write your own code that uses jQuery, then follow the instructions on jQuery’s website. (Note, however, that there isn’t very much left in jQuery that isn’t just as easy to do with native DOM and Web APIs).
Note that the instructions for Bootstrap 4 told you to get jQuery from jQuery’s website too. Bootstrap have never hosted jQuery for their users.
solved How to get JQuery from getbootstrap website? [closed]