Bump ejs and @vue/cli-service

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


Removes `ejs`

Updates `@vue/cli-service` from 4.5.8 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)

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

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

package.json

@@ -15,7 +15,7 @@
   "devDependencies": {
     "@vue/cli-plugin-babel": "~4.5.0",
     "@vue/cli-plugin-eslint": "~4.5.0",
-    "@vue/cli-service": "~4.5.0",
+    "@vue/cli-service": "~5.0.8",
     "babel-eslint": "^10.1.0",
     "css-loader": "^5.0.1",
     "eslint": "^6.7.2",