Update docker requirement from <7,>=3.7.2 to >=3.7.2,<8 (#4713)

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@3.7.2...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>

requirements.txt

@@ -1,6 +1,6 @@
 dill>=0.3.2, <0.4
 requests>=2, <3
-docker>=3.7.2, <7
+docker>=3.7.2, <8
 # Work around https://github.com/docker/docker-py/issues/3113
 urllib3>=1.26.0,<3
 python-dateutil