Bump requests from 2.21.0 to 2.31.0

Bumps [requests](https://github.com/psf/requests) from 2.21.0 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@v2.21.0...v2.31.0)

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

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

requirements.txt

@@ -3,6 +3,6 @@ html5lib==1.0.1
 nose==1.3.7
 mock==2.0.0
 lxml==4.9.1
-requests==2.21.0
+requests==2.31.0
 BeautifulSoup4==4.6.3
 -e .