Bump requests from 2.28.2 to 2.31.0

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](psf/requests@v2.28.2...v2.31.0)

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

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

requirements.txt

@@ -9,7 +9,7 @@ flask-talisman==1.0.0
 gunicorn==20.1.0
 pycodestyle==2.10.0
 pydocstyle==6.3.0
-requests==2.28.2
+requests==2.31.0
 Sphinx==6.1.3
 Werkzeug==2.2.3
 setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability