build(deps): bump python-dateutil from 2.9.0.post0 to 3.0.0 in /docs

Bumps [python-dateutil](https://github.com/dateutil/dateutil) from 2.9.0.post0 to 3.0.0.
- [Release notes](https://github.com/dateutil/dateutil/releases)
- [Changelog](https://github.com/dateutil/dateutil/blob/master/NEWS)
- [Commits](https://github.com/dateutil/dateutil/compare/2.9.0.post0...3.0.0)

---
updated-dependencies:
- dependency-name: python-dateutil
  dependency-version: 3.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

docs/requirements.txt

@@ -17,7 +17,7 @@ pathspec==1.1.1
 platformdirs==4.13.5
 Pygments==2.21.0
 pymdown-extensions==12.3
-python-dateutil==2.9.0.post0
+python-dateutil==3.0.0
 PyYAML==6.0.3
 pyyaml_env_tag==1.1
 six==1.17.0