Degrade @vue/cli-service

package.json

@@ -29,7 +29,7 @@
     "@babel/plugin-proposal-optional-chaining": "^7.13.12",
     "@vue/cli-plugin-babel": "^4.5.12",
     "@vue/cli-plugin-eslint": "^3.1.1",
-    "@vue/cli-service": "^4.5.13",
+    "@vue/cli-service": "^3.12.1",
     "babel-eslint": "^10.1.0",
     "eslint": "^5.16.0",
     "eslint-plugin-vue": "^5.0.0",