⬆️ Update docker requirement from ^4.2.0 to ^5.0.3

Updates the requirements on [docker](https://github.com/docker/docker-py) to permit the latest version.
- [Release notes](https://github.com/docker/docker-py/releases)
- [Commits](docker/docker-py@4.2.0...5.0.3)

---
updated-dependencies:
- dependency-name: docker
  dependency-type: direct:production
...

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

pyproject.toml

@@ -7,7 +7,7 @@ license = "MIT"
 
 [tool.poetry.dependencies]
 python = "^3.6"
-docker = "^4.2.0"
+docker = "^5.0.3"
 pytest = "^5.4.1"
 
 [tool.poetry.dev-dependencies]