Bump requests from 2.27.1 to 2.31.0 in /docs

Bumps [requests](https://github.com/psf/requests) from 2.27.1 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@v2.27.1...v2.31.0)

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

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

docs/requirements_mac.txt

@@ -14,7 +14,7 @@ packaging==21.3
 Pygments==2.11.2
 pyparsing==3.0.7
 pytz==2021.3
-requests==2.27.1
+requests==2.31.0
 smmap==5.0.0
 snowballstemmer==2.2.0
 Sphinx==4.4.0