Bump requests from 2.23.0 to 2.25.1

Bumps [requests](https://github.com/psf/requests) from 2.23.0 to 2.25.1.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/master/HISTORY.md)
- [Commits](psf/requests@v2.23.0...v2.25.1)

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

requirements.txt

@@ -5,7 +5,7 @@ idna==2.9
 jsonschema==3.2.0
 kinto-http==10.7.0
 pyrsistent==0.16.0
-requests==2.23.0
+requests==2.25.1
 ruamel.yaml==0.16.10
 six==1.14.0
 Unidecode==1.1.1