Update flask-limiter[redis] requirement from ~=3.8 to ~=3.9

Updates the requirements on [flask-limiter[redis]](https://github.com/alisaifee/flask-limiter) to permit the latest version.
- [Release notes](https://github.com/alisaifee/flask-limiter/releases)
- [Changelog](https://github.com/alisaifee/flask-limiter/blob/master/HISTORY.rst)
- [Commits](alisaifee/flask-limiter@3.8.0...3.9.2)

---
updated-dependencies:
- dependency-name: flask-limiter[redis]
  dependency-type: direct:production
...

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

requirements.txt

@@ -3,7 +3,7 @@
 
 bootstrap-flask~=2.4
 flask~=3.1
-flask-limiter[redis]~=3.8
+flask-limiter[redis]~=3.9
 flask-wtf~=1.2
 gunicorn[eventlet]~=23.0
 python-dateutil~=2.9