Python code modernization, 3/n (#1157)

* Remove __metaclass__ = type.

for i in $(grep -REl '__metaclass__ = type' plugins/ tests/); do
  sed -e '/^__metaclass__ = type/d' -i $i;
done

* Remove super arguments, and stop inheriting from object.

plugins/modules/docker_compose_v2_run.py

@@ -253,7 +253,7 @@ from ansible_collections.community.docker.plugins.module_utils._compose_v2 impor
 
 class ExecManager(BaseComposeManager):
     def __init__(self, client):
-        super(ExecManager, self).__init__(client)
+        super().__init__(client)
         parameters = self.client.module.params
 
         self.service = parameters["service"]