Bump requests from 2.24.0 to 2.25.0

Bumps [requests](https://github.com/psf/requests) from 2.24.0 to 2.25.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/master/HISTORY.md)
- [Commits](psf/requests@v2.24.0...v2.25.0)

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

requirements.txt

@@ -9,6 +9,6 @@ flask-talisman==0.7.0
 gunicorn==20.0.4
 pycodestyle==2.6.0
 pydocstyle==5.1.1
-requests==2.24.0
+requests==2.25.0
 Sphinx==3.3.0
 Werkzeug==1.0.1