Bump vue-router from 4.0.0-rc.6 to 4.0.1 (#6953)

Bumps [vue-router](https://github.com/vuejs/vue-router) from 4.0.0-rc.6 to 4.0.1.
- [Release notes](https://github.com/vuejs/vue-router/releases)
- [Changelog](https://github.com/vuejs/vue-router/blob/dev/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vue-router/commits

)

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