Update gunicorn[eventlet] requirement from ~=22.0 to ~=23.0

Updates the requirements on [gunicorn[eventlet]](https://github.com/benoitc/gunicorn) to permit the latest version.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@22.0.0...23.0.0)

---
updated-dependencies:
- dependency-name: gunicorn[eventlet]
  dependency-type: direct:production
...

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

requirements.txt

@@ -5,6 +5,6 @@ bootstrap-flask~=2.4
 flask~=3.0
 flask-limiter[redis]~=3.8
 flask-wtf~=1.2
-gunicorn[eventlet]~=22.0
+gunicorn[eventlet]~=23.0
 python-dateutil~=2.9
 requests~=2.32