Cleanup with ruff check (#1182)

* Implement improvements suggested by ruff check.

* Add ruff check to CI.

tests/unit/plugins/modules/test_docker_image.py

@@ -23,7 +23,6 @@ from ..test_support.docker_image_archive_stubbing import (
 
 if t.TYPE_CHECKING:
     from collections.abc import Callable
-    from pathlib import Path
 
 
 def assert_no_logging(msg: str) -> t.NoReturn:

tests/unit/plugins/modules/test_docker_swarm_service.py

@@ -156,7 +156,7 @@ def test_has_list_changed() -> None:
         [{"a": 1}, {"a": 2}], [{"a": 1}, {"a": 2}], sort_key="a"
     )
 
-    with pytest.raises(Exception):
+    with pytest.raises(ValueError):
         docker_swarm_service.has_list_changed(
             [{"a": 1}, {"a": 2}], [{"a": 1}, {"a": 2}]
         )