testing: update docker-py to 7.0.0

full diff: https://github.com/docker/docker-py/compare/7.0.0b1...7.0.0

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit b524ed2dda6539dd746aa807a5bfa995d3a7857e)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

hack/make/test-docker-py

@@ -4,7 +4,7 @@ set -e
 source hack/make/.integration-test-helpers
 
 # The commit or tag to use for testing
-: "${DOCKER_PY_COMMIT:=7.0.0b1}"
+: "${DOCKER_PY_COMMIT:=7.0.0}"
 
 # custom options to pass py.test
 #