[IMP] web: update bootstrap 4.2.1 -> 4.3.1

See https://blog.getbootstrap.com/2019/02/11/bootstrap-4-3-0/
and https://blog.getbootstrap.com/2019/02/13/bootstrap-4-3-1-and-3-4-1/

Again, some fixes were added in this version and not in a 4.2.x version
so there is no clean way to backport them in 12.0 / saas-12.2.
If needed, the file bootstrap_review.scss is there for that.

Among the new features, two notable ones:
- The '.modal-dialog-scrollable' class which does what odoo already
  implemented for all its modals. So we could remove our custom code in
  a next update.
- Responsive font sizes ! Plan was to develop something similar for the
  website, so this comes at the right time. The behavior is opt-in, we
  will enable it in a next update.

Part of https://github.com/odoo/odoo/pull/31401
task-1944790

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