Bump @vue/cli-plugin-vuex from 4.1.2 to 5.0.8

Bumps [@vue/cli-plugin-vuex](https://github.com/vuejs/vue-cli/tree/HEAD/packages/@vue/cli-plugin-vuex) from 4.1.2 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-vuex)

---
updated-dependencies:
- dependency-name: "@vue/cli-plugin-vuex"
  dependency-version: 5.0.8
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]