Bump types-python-dateutil in /server (#378)

Bumps [types-python-dateutil](https://github.com/python/typeshed) from 2.9.0.20241003 to 2.9.0.20241206.
- [Commits](https://github.com/python/typeshed/commits)

---
updated-dependencies:
- dependency-name: types-python-dateutil
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

server/requirements.txt

@@ -277,7 +277,7 @@ superdesk-core[exiv2] @ git+https://github.com/superdesk/superdesk-core.git@rele
     #   superdesk-core
 superdesk-planning @ git+https://github.com/superdesk/superdesk-planning.git@release/2.8
     # via -r requirements.in
-types-python-dateutil==2.9.0.20241003
+types-python-dateutil==2.9.0.20241206
     # via arrow
 typing-extensions==4.12.2
     # via