Bump gevent from 23.7.0 to 23.9.1 in /runtimes/sklearn (#1411)

Bumps [gevent](https://github.com/gevent/gevent) from 23.7.0 to 23.9.1.
- [Release notes](https://github.com/gevent/gevent/releases)
- [Changelog](https://github.com/gevent/gevent/blob/master/docs/changelog_pre.rst)
- [Commits](gevent/gevent@23.7.0...23.9.1)

---
updated-dependencies:
- dependency-name: gevent
  dependency-type: indirect
...

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