Bump gevent from 23.7.0 to 23.9.0 (#1361)

Bumps [gevent](https://github.com/gevent/gevent) from 23.7.0 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@23.7.0...23.9.0)

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

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

requirements.txt

@@ -4,7 +4,7 @@ wagtail==4.2.4
 dj-database-url>=1.0.0,<2.0
 psycopg2==2.9.3
 gunicorn==20.1.0
-gevent==23.7.0
+gevent==23.9.0
 django-dotenv==1.4.2
 django-google-optimize==0.3.0
 django-markdownify>=0.9.2,<1.0