fix: packages/san-cli-webpack/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-IP-12704893
- https://snyk.io/vuln/SNYK-JS-IP-12761655

Author: snyk-bot

packages/san-cli-webpack/package.json

@@ -9,7 +9,7 @@
         "san-cli-utils": "^1.0.5",
         "tty-table": "^2.8.2",
         "webpack": "^5.38.1",
-        "webpack-dev-server": "^3.11.2"
+        "webpack-dev-server": "^4.8.0"
     },
     "author": "ksky521",
     "keywords": [