Bump requests from 2.21.0 to 2.25.1

Bumps [requests](https://github.com/psf/requests) from 2.21.0 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@v2.21.0...v2.25.1)

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

Author: dependabot-preview[bot]

requirements.txt

@@ -34,7 +34,7 @@ pyyaml==5.4
     # via django-amber
 rcssmin==1.0.6
     # via django-compressor
-requests==2.21.0
+requests==2.25.1
     # via
     #   -r requirements.in
     #   django-amber