Bump docker from 4.0.2 to 4.1.0

Bumps [docker](https://github.com/docker/docker-py) from 4.0.2 to 4.1.0.
- [Release notes](https://github.com/docker/docker-py/releases)
- [Commits](docker/docker-py@4.0.2...4.1.0)

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

requirements.txt

@@ -122,7 +122,7 @@ pycountry
 uWSGI==2.0.18
 gunicorn==19.9.0
 ipython==5.8.0
-docker==4.0.2
+docker==4.1.0
 invoke==1.3.0
 
 # tests