Update dependency webpack-dev-server to v3.11.3

Author: renovate-bot

package-lock.json

@@ -40,6 +40,6 @@
     "vue-template-compiler": "2.6.14",
     "webpack": "4.46.0",
     "webpack-cli": "3.3.12",
-    "webpack-dev-server": "3.11.2"
+    "webpack-dev-server": "3.11.3"
   }
 }