Bump docker library to fix upstream break by requests

See:
- docker/docker-py#3257

setup.py

@@ -108,7 +108,7 @@ def get_version(version_file):
             # 1.11.1 fixed this issue, but to ensure expected behavior we'll pin
             # to never grab the regression version.
             "coveralls != 1.11.0",
-            "docker == 7.0.0",
+            "docker == 7.1.0",
             "hypothesis",
             "mimesis-factory",
             "mimesis",