Bump requests from 2.21.0 to 2.23.0

Bumps [requests](https://github.com/psf/requests) from 2.21.0 to 2.23.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/master/HISTORY.md)
- [Commits](psf/requests@v2.21.0...v2.23.0)

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

requirements.txt

@@ -25,7 +25,7 @@ pyramid-multiauth==0.9.0
 pyramid-tm==2.4
 python-dateutil==2.8.1
 repoze.lru==0.7
-requests==2.21.0
+requests==2.23.0
 simplejson==3.16.0
 six==1.15.0
 transaction==3.0.0