fix(b-nav-item-dropdown): `boundary` handling in `<b-navbar>` (closes #5789)#5794

jacobmllr95 merged 2 commits intodevbootstrap-vue/bootstrap-vue:devfrom

fix-dropdown-boundary-handling-in-b-navbarbootstrap-vue/bootstrap-vue:fix-dropdown-boundary-handling-in-b-navbarCopy head branch name to clipboard