Bump requests from 2.11.0 to 2.31.0 in /requirements

Bumps [requests](https://github.com/psf/requests) from 2.11.0 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@v2.11.0...v2.31.0)

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

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

requirements/base.txt

@@ -52,7 +52,7 @@ djangorestframework
 mysqlclient
 oauthlib
 python3-openid
-requests==2.11.0
+requests==2.31.0
 requests-oauthlib
 python-memcached
 # git+https://github.com/mobolic/facebook-sdk.git#egg=facebook-sdk