add webpack-dev-server to dependencies (#1680)

Author: leightkt

examples/with-vanilla-js/package.json

@@ -13,7 +13,8 @@
     "css-loader": "^6.7.3",
     "style-loader": "^3.3.2",
     "webpack": "^5.79.0",
-    "webpack-cli": "^5.0.1"
+    "webpack-cli": "^5.0.2",
+    "webpack-dev-server": "^4.13.3"
   },
   "dependencies": {
     "@web3-onboard/coinbase": "^2.2.2",