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>

Author: dependabot-preview[bot]

requirements-dev.txt

@@ -5,7 +5,7 @@ aiohttp==3.6.1
 aiomysql==0.0.20
 aiopg==1.0.0
 coverage==4.5.4
-docker==4.0.2
+docker==4.1.0
 flake8==3.7.8
 ipdb==0.12.2
 motor==2.0.0