Update docker requirement from <7.0,>=4.0 to >=4.0,<8.0

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@4.0.0...7.0.0)

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

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

requirements.txt

@@ -7,7 +7,7 @@ asyncpg >= 0.23
 click >= 8.0, < 8.2
 cryptography >= 36.0.1
 dateparser >= 1.1.1, < 2.0.0
-docker >= 4.0, < 7.0
+docker >= 4.0, < 8.0
 graphviz >= 0.20.1
 griffe >= 0.20.0
 jinja2 >= 3.0.0, < 4.0.0