Merge pull request #657 from ohbarye/dependabot/npm_and_yarn/frontend/webpack-dev-server-4.6.0

Bump webpack-dev-server from 3.11.2 to 4.6.0 in /frontend

Author: ohbarye

frontend/package.json

@@ -22,7 +22,7 @@
     "typescript": "^4.5.2",
     "webpack": "^4.44.2",
     "webpack-cli": "^3.3.12",
-    "webpack-dev-server": "^3.11.2"
+    "webpack-dev-server": "^4.6.0"
   },
   "dependencies": {
     "react": "^17.0.2",