Bump requests from 2.28.2 to 2.31.0 in /docs

Bumps [requests](https://github.com/psf/requests) from 2.28.2 to 2.31.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](https://github.com/psf/requests/compare/v2.28.2...v2.31.0)

---
updated-dependencies:
- dependency-name: requests
  dependency-type: indirect
...

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

docs/requirements.txt

@@ -53,7 +53,7 @@ pytz==2022.7
     # via babel
 pyyaml==6.0
     # via myst-parser
-requests==2.28.2
+requests==2.31.0
     # via sphinx
 six==1.16.0
     # via fluent-pygments