chore(deps): bump express from 4.17.3 to 4.20.0 in /frontend/server (k…

…ubeflow#11201)

Bumps [express](https://github.com/expressjs/express) from 4.17.3 to 4.20.0.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.17.3...4.20.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>