Update docker requirement from <6,>=5 to >=5,<8 (#1052)

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@5.0.0...7.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements/adapter_testing.txt

@@ -1,5 +1,5 @@
 # pip install -r requirements/adapter_testing.txt
 moto>=3,<6                               # For AWS tests
-docker>=5,<6                             # Used by moto
+docker>=5,<8                             # Used by moto
 boddle>=0.2,<0.3                         # For Bottle app tests
 sanic-testing>=0.7; python_version>"3.6"