Update dependency webpack-dev-server to v3.10.3

Author: renovate-bot

package-lock.json

@@ -41,6 +41,6 @@
     "start-server-and-test": "1.10.8",
     "webpack": "4.41.5",
     "webpack-cli": "3.3.10",
-    "webpack-dev-server": "3.10.2"
+    "webpack-dev-server": "3.10.3"
   }
 }