chore(deps-dev): bump types-python-dateutil

Bumps [types-python-dateutil](https://github.com/python/typeshed) from 2.9.0.20260408 to 2.9.0.20260518.
- [Commits](https://github.com/python/typeshed/commits)

---
updated-dependencies:
- dependency-name: types-python-dateutil
  dependency-version: 2.9.0.20260518
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

poetry.lock

@@ -47,6 +47,6 @@ pytest = "9.0.3"
 flake8 = "7.3.0"
 deepdiff = "9.0.0"
 mypy = "1.20.2"
-types-python-dateutil = "2.9.0.20260408"
+types-python-dateutil = "2.9.0.20260518"
 tox = "4.53.0"
 sortedcontainers-stubs = "2.4.3"