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

@@ -36,7 +36,7 @@ Flask-SQLAlchemy==2.1
 Flask-Testing==0.8.1
 Flask-WTF==1.0.0
 funcsigs==0.4
-gevent==22.10.2
+gevent==23.9.0
 greenlet==2.0.2
 gunicorn==19.9.0
 h11==0.11.0