Bump setuptools from 80.0.0 to 80.9.0 in /docs

Bumps [setuptools](https://github.com/pypa/setuptools) from 80.0.0 to 80.9.0.
- [Release notes](https://github.com/pypa/setuptools/releases)
- [Changelog](https://github.com/pypa/setuptools/blob/main/NEWS.rst)
- [Commits](pypa/setuptools@v80.0.0...v80.9.0)

---
updated-dependencies:
- dependency-name: setuptools
  dependency-version: 80.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docs/requirements.txt

@@ -12,7 +12,7 @@ imagesize==1.4.1
 pytz==2025.2
 recommonmark==0.7.1
 requests>=2.20.0
-setuptools==80.0.0
+setuptools==80.9.0
 six==1.17.0
 snowballstemmer==3.0.1
 sphinx==8.1.3