chore(deps): update devdependency @vue/test-utils to v2

Author: renovate[bot]

package.json

@@ -63,7 +63,7 @@
     "@commitlint/config-conventional": "^7.5.0",
     "@nuxtjs/eslint-config": "^0.0.1",
     "@vue/server-test-utils": "1.0.0-beta.29",
-    "@vue/test-utils": "1.0.0-beta.29",
+    "@vue/test-utils": "2.4.4",
     "cheerio": "^1.0.0-rc.2",
     "codecov": "^3.2.0",
     "eslint": "^5.15.1",