Bump docker from 4.4.1 to 4.4.4

Bumps [docker](https://github.com/docker/docker-py) from 4.4.1 to 4.4.4.
- [Release notes](https://github.com/docker/docker-py/releases)
- [Commits](docker/docker-py@4.4.1...4.4.4)

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

Author: dependabot-preview[bot]

dev-requirements.txt

@@ -6,7 +6,7 @@ autoflake==1.4
 black==20.8b1
 check-manifest==0.46
 doc8==0.8.1
-docker==4.4.1
+docker==4.4.4
 dodgy==0.2.1  # Look for uploaded secrets
 flake8-commas==2.0.0  # Require silicon valley commas
 flake8-quotes==3.2.0  # Require single quotes