Bump @vue/cli-service from 3.12.1 to 4.1.1 in /vuejs

Bumps [@vue/cli-service](https://github.com/vuejs/vue-cli/tree/HEAD/packages/@vue/cli-service) from 3.12.1 to 4.1.1.
- [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/v4.1.1/packages/@vue/cli-service)

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

vuejs/package.json

@@ -24,7 +24,7 @@
     "@vue/cli-plugin-babel": "^3.12.0",
     "@vue/cli-plugin-eslint": "^3.12.0",
     "@vue/cli-plugin-unit-jest": "^3.12.0",
-    "@vue/cli-service": "^3.12.0",
+    "@vue/cli-service": "^4.1.1",
     "@vue/eslint-config-standard": "^4.0.0",
     "@vue/test-utils": "1.0.0-beta.29",
     "babel-core": "7.0.0-bridge.0",