chore(deps): bump python-dateutil from 3.0.0 to 4.0.0 in /docs/_build

Bumps [python-dateutil](https://github.com/dateutil/dateutil) from 3.0.0 to 4.0.0.
- [Release notes](https://github.com/dateutil/dateutil/releases)
- [Changelog](https://github.com/dateutil/dateutil/blob/master/NEWS)
- [Commits](https://github.com/dateutil/dateutil/compare/3.0.0...4.0.0)

---
updated-dependencies:
- dependency-name: python-dateutil
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

docs/_build/requirements.txt

@@ -14,7 +14,7 @@ packaging==26.3
 Pygments==2.21.0
 pymdown-extensions==12.3
 pyparsing==3.3.3
-python-dateutil==3.0.0
+python-dateutil==4.0.0
 PyYAML==6.0.3
 pyyaml_env_tag==1.1
 six==1.17.0