Bump merge and @vue/cli

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


Removes `merge`

Updates `@vue/cli` from 4.5.19 to 5.0.9
- [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/v5.0.9/packages/@vue/cli)

---
updated-dependencies:
- dependency-name: merge
  dependency-version: 
  dependency-type: indirect
- dependency-name: "@vue/cli"
  dependency-version: 5.0.9
  dependency-type: direct:development
...

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Author: dependabot[bot]