Bump express from 5.0.1 to 5.1.0 in /sandbox

Bumps [express](https://github.com/expressjs/express) from 5.0.1 to 5.1.0.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@v5.0.1...v5.1.0)

---
updated-dependencies:
- dependency-name: express
  dependency-version: 5.1.0
  dependency-type: direct:production
...

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Author: dependabot[bot]