build(deps): bump ejs, @vue/cli-service and @vue/cli-plugin-unit-jest

Bumps [ejs](https://github.com/mde/ejs), [@vue/cli-service](https://github.com/vuejs/vue-cli/tree/HEAD/packages/@vue/cli-service) and [@vue/cli-plugin-unit-jest](https://github.com/vuejs/vue-cli/tree/HEAD/packages/@vue/cli-plugin-unit-jest). These dependencies needed to be updated together.

Removes `ejs`

Updates `@vue/cli-service` from 4.5.17 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-service)

Updates `@vue/cli-plugin-unit-jest` from 4.5.17 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-unit-jest)

---
updated-dependencies:
- dependency-name: ejs
  dependency-type: indirect
- dependency-name: "@vue/cli-service"
  dependency-type: direct:development
- dependency-name: "@vue/cli-plugin-unit-jest"
  dependency-type: direct:development
...

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

Author: dependabot[bot]