MESH-2092 Bump types-python-dateutil in the dependencies group

Bumps the dependencies group with 1 update: [types-python-dateutil](https://github.com/python/typeshed).


Updates `types-python-dateutil` from 2.9.0.20260323 to 2.9.0.20260402
- [Commits](https://github.com/python/typeshed/commits)

---
updated-dependencies:
- dependency-name: types-python-dateutil
  dependency-version: 2.9.0.20260402
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

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

Author: dependabot[bot]