Bump gevent from 1.2.1 to 23.9.0 in /requirements

Bumps [gevent](https://github.com/gevent/gevent) from 1.2.1 to 23.9.0.
- [Release notes](https://github.com/gevent/gevent/releases)
- [Changelog](https://github.com/gevent/gevent/blob/master/docs/changelog_1_2.rst)
- [Commits](gevent/gevent@1.2.1...23.9.0)

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

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

requirements/production.txt

@@ -9,7 +9,7 @@ psycopg2==2.7
 
 # WSGI Handler
 # ------------------------------------------------
-gevent==1.2.1
+gevent==23.9.0
 gunicorn==19.6.0
 
 # Static and Media Storage