Bump tough-cookie and @vue/cli-plugin-router in /vue-expenses-client

Removes [tough-cookie](https://github.com/salesforce/tough-cookie). It's no longer used after updating ancestor dependency [@vue/cli-plugin-router](https://github.com/vuejs/vue-cli/tree/HEAD/packages/@vue/cli-plugin-router). These dependencies need to be updated together.


Removes `tough-cookie`

Updates `@vue/cli-plugin-router` from 4.5.19 to 5.0.8
- [Release notes](https://github.com/vuejs/vue-cli/releases)
- [Changelog](https://github.com/vuejs/vue-cli/blob/dev/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vue-cli/commits/v5.0.8/packages/@vue/cli-plugin-router)

---
updated-dependencies:
- dependency-name: tough-cookie
  dependency-type: indirect
- dependency-name: "@vue/cli-plugin-router"
  dependency-type: direct:development
...

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

Author: dependabot[bot]