Bump @web/dev-server from 0.2.1 to 0.2.3 in /frontend

Bumps [@web/dev-server](https://github.com/modernweb-dev/web/tree/HEAD/packages/dev-server) from 0.2.1 to 0.2.3.
- [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@0.2.3/packages/dev-server)

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

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