Merge branch 'upgrade-bootstrap-vue/specs-update-boards-ee' into 'master'

Make EE boards specs compatible w/ BootstrapVue 2

See merge request gitlab-org/gitlab!19905

ee/spec/frontend/boards/issue_card_spec.js

@@ -22,6 +22,7 @@ describe('Issue card component', () => {
         ...props,
       },
       sync: false,
+      attachToDocument: true,
     });
   };