Describe the bug

Apparently the <b-dropdown-item> component creates router-link with properties tag and event by default. As a consequence Firefox console prints two warnings:

[vue-router] 's tag prop is deprecated and has been removed in Vue Router 4. Use the v-slot API to remove this warning: https://next.router.vuejs.org/guide/migration/#removal-of-event-and-tag-props-in-router-link.

[vue-router] 's event prop is deprecated and has been removed in Vue Router 4. Use the v-slot API to remove this warning: https://next.router.vuejs.org/guide/migration/#removal-of-event-and-tag-props-in-router-link.

Steps to reproduce the bug

1. Implement vue-router to vue-bootstrap project as described here : https://router.vuejs.org/installation.html#npm
2. Within template of some component use <b-dropdown> or <b-nav-item-dropdown> like so:
   <b-dropdown text="This dropdown"> <b-dropdown-item to="/home"> Home </b-dropdown-item> </b-dropdown>
3. check in browser and get above mentioned warnings

Expected behavior

Dropdown components should use new v-slot API instead of tag and event when creating a <router-link>.

Versions

Libraries:

• BootstrapVue: 2.21.2
• Bootstrap: 4.5.3
• Vue: 2.6.11
• Vue-Router: 3.5.1

Environment:

• OS: Windows 10
• Browser: Firefox
• Version: 84.0.2

Demo link

https://codesandbox.io/s/vibrant-visvesvaraya-mt574