Update dependency webpack-dev-server to v3.11.2

Author: renovate-bot

package.json

@@ -129,7 +129,7 @@
     "style-loader": "1.3.0",
     "webpack": "4.46.0",
     "webpack-cli": "3.3.12",
-    "webpack-dev-server": "3.11.1",
+    "webpack-dev-server": "3.11.2",
     "optimize-css-assets-webpack-plugin": "5.0.4",
     "terser-webpack-plugin": "4.2.2",
     "webpack-merge": "4.2.2"