Bootstrap requires popper.js

[jp-sauve]

This library isn't loaded using the Bootstrap Library module, and it's not loaded in Barrio subtheme.
While not a fix, I've had some success loading the css from the CDN using Bootstrap Library module, and then in the theme, choosing to load the js from a local source. Bootstrap (for now) includes bootstrap.bundle.js which includes the popper.js library, so I can load this for now (locally) and will wait on a change in the Bootstrap Library module.