Update vue monorepo to v2.6.12

Author: renovate-bot

package-lock.json

@@ -35,9 +35,9 @@
     "sass-loader": "7.3.1",
     "script-ext-html-webpack-plugin": "2.1.4",
     "start-server-and-test": "1.11.3",
-    "vue": "2.6.11",
+    "vue": "2.6.12",
     "vue-loader": "15.9.3",
-    "vue-template-compiler": "2.6.11",
+    "vue-template-compiler": "2.6.12",
     "webpack": "4.44.1",
     "webpack-cli": "3.3.12",
     "webpack-dev-server": "3.11.0"