chore(deps-dev): Bump webpack-dev-server

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 4.15.1 to 5.2.1.
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/master/CHANGELOG.md)
- [Commits](webpack/webpack-dev-server@v4.15.1...v5.2.1)

---
updated-dependencies:
- dependency-name: webpack-dev-server
  dependency-version: 5.2.1
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

packages/extension-playground/package.json

@@ -29,7 +29,7 @@
     "@types/styled-system": "5.1.13",
     "webpack-bundle-analyzer": "^4.4.1",
     "webpack-cli": "5.0.1",
-    "webpack-dev-server": "4.15.1",
+    "webpack-dev-server": "5.2.1",
     "webpack-merge": "^5.7.3"
   }
 }