Bump gevent from 22.10.2 to 23.9.0 in /requirements

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-version: 23.9.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/base.txt

@@ -22,6 +22,6 @@ whitenoise==6.1.0
 psycopg2-binary==2.9.10
 djangorestframework==3.14.0
 django-htmx==1.15.0
-gevent==22.10.2  # Updated version of gevent
+gevent==23.9.0  # Updated version of gevent
 greenlet==3.0.3  # Updated version of greenlet
 requests-oauthlib==1.3.1

requirements/production.txt

@@ -1,7 +1,7 @@
 -r base.txt
 certifi==2021.10.8
 django-redis-cache==3.0.1
-gevent==22.10.2  # Ensure this matches the updated version in base.txt
+gevent==23.9.0  # Ensure this matches the updated version in base.txt
 greenlet==3.0.3  # Ensure this matches the updated version in base.txt
 raven==6.10.0
 redis==3.5.3