Bump @vue/test-utils from 1.1.2 to 1.1.3 in /frontend

Bumps [@vue/test-utils](https://github.com/vuejs/vue-test-utils/tree/HEAD/packages/test-utils) from 1.1.2 to 1.1.3.
- [Release notes](https://github.com/vuejs/vue-test-utils/releases)
- [Changelog](https://github.com/vuejs/vue-test-utils/blob/dev/packages/test-utils/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vue-test-utils/commits/v1.1.3/packages/test-utils)

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

frontend/package.json

@@ -44,7 +44,7 @@
     "@nuxtjs/google-analytics": "^2.4.0",
     "@nuxtjs/google-fonts": "^1.2.0",
     "@nuxtjs/stylelint-module": "^4.0.0",
-    "@vue/test-utils": "^1.1.0",
+    "@vue/test-utils": "^1.1.3",
     "babel-core": "7.0.0-bridge.0",
     "babel-eslint": "^10.1.0",
     "babel-jest": "^26.5.0",