Bump @web/dev-server from 0.2.1 to 0.3.0 in /frontend

Bumps [@web/dev-server](https://github.com/modernweb-dev/web/tree/HEAD/packages/dev-server) from 0.2.1 to 0.3.0.
- [Release notes](https://github.com/modernweb-dev/web/releases)
- [Changelog](https://github.com/modernweb-dev/web/blob/master/packages/dev-server/CHANGELOG.md)
- [Commits](https://github.com/modernweb-dev/web/commits/@web/dev-server@0.3.0/packages/dev-server)

---
updated-dependencies:
- dependency-name: "@web/dev-server"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

frontend/package.json

@@ -38,6 +38,6 @@
     "yjs": "^12.3.3"
   },
   "devDependencies": {
-    "@web/dev-server": "^0.2.1"
+    "@web/dev-server": "^0.3.0"
   }
 }