Bump vue-router from 4.6.4 to 5.0.2 in /frontend

Bumps [vue-router](https://github.com/vuejs/router) from 4.6.4 to 5.0.2.
- [Release notes](https://github.com/vuejs/router/releases)
- [Commits](vuejs/router@v4.6.4...v5.0.2)

---
updated-dependencies:
- dependency-name: vue-router
  dependency-version: 5.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]