fix(b-dropdown): Sets correct `aria-haspopup` attribute for the toggle button#6865

xanf merged 3 commits intobootstrap-vue:devbootstrap-vue/bootstrap-vue:devfrom

sharlatta:Fix-aria-haspopup-attr-for-the-dropdown-togglesharlatta/bootstrap-vue:Fix-aria-haspopup-attr-for-the-dropdown-toggleCopy head branch name to clipboard