Bump requests from 2.30.0 to 2.31.0 in /docs (#251)

Bumps [requests](https://github.com/psf/requests) from 2.30.0 to 2.31.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.30.0...v2.31.0)

---
updated-dependencies:
- dependency-name: requests
  dependency-type: direct:production
...

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Author: dependabot[bot]

docs/requirements.txt

@@ -16,7 +16,7 @@ packaging==23.1
 Pygments==2.15.1
 pytz==2023.3
 PyYAML==6.0
-requests==2.30.0
+requests==2.31.0
 snowballstemmer==2.2.0
 Sphinx==6.2.1
 sphinxcontrib-applehelp==1.0.4