chore(deps): bump python-dateutil in /monitoring_flask_backend

Bumps [python-dateutil](https://github.com/dateutil/dateutil) from 2.8.2 to 2.9.0.post0.
- [Release notes](https://github.com/dateutil/dateutil/releases)
- [Changelog](https://github.com/dateutil/dateutil/blob/master/NEWS)
- [Commits](dateutil/dateutil@2.8.2...2.9.0.post0)

---
updated-dependencies:
- dependency-name: python-dateutil
  dependency-version: 2.9.0.post0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

monitoring_flask_backend/requirements.txt

@@ -1,6 +1,6 @@
 Flask==3.0.0
 prometheus-api-client==0.5.4
-python-dateutil==2.8.2
+python-dateutil==2.9.0.post0
 gunicorn==23.0.0
 requests==2.32.4
 pytest==8.3.4