Update python-dateutil requirement from ==2.8.* to ==2.9.*

Updates the requirements on [python-dateutil](https://github.com/dateutil/dateutil) to permit the latest version.
- [Release notes](https://github.com/dateutil/dateutil/releases)
- [Changelog](https://github.com/dateutil/dateutil/blob/master/NEWS)
- [Commits](dateutil/dateutil@2.8.0...2.9.0.post0)

---
updated-dependencies:
- dependency-name: python-dateutil
  dependency-type: direct:production
...

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

requirements.txt

@@ -4,7 +4,7 @@ numpy==1.26.*
 openpyxl==3.0.*
 pandas==2.1.*
 pyquery==2.0.*
-python-dateutil==2.8.*
+python-dateutil==2.9.*
 requests==2.32.*
 cepimose==0.1.34
 # git+https://github.com/sledilnik/py-cepimose@master#egg=cepimose