Bump gevent from 22.10.2 to 23.9.0

Bumps [gevent](https://github.com/gevent/gevent) from 22.10.2 to 23.9.0.
- [Release notes](https://github.com/gevent/gevent/releases)
- [Changelog](https://github.com/gevent/gevent/blob/master/docs/changelog_pre.rst)
- [Commits](gevent/gevent@22.10.2...23.9.0)

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

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

requirements.txt

@@ -1,3 +1,3 @@
 # Pin pyyaml to 5.3.1 until yaml/pyyaml#724 is fixed.
 PyYAML==5.3.1
-gevent==22.10.2
+gevent==23.9.0