Bump types-python-dateutil from 2.8.8 to 2.8.9

Bumps [types-python-dateutil](https://github.com/python/typeshed) from 2.8.8 to 2.8.9.
- [Release notes](https://github.com/python/typeshed/releases)
- [Commits](https://github.com/python/typeshed/commits)

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

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

Author: dependabot[bot]

requirements-test.txt

@@ -4,6 +4,6 @@ pytest-cov==3.0.*
 isort==5.9.*
 flake8==4.0.*
 mypy==0.931
-types-python-dateutil==2.8.8
+types-python-dateutil==2.8.9
 freezegun==1.1.0
 types-freezegun