Stop sub-classing object (#8249)

changelog.d/8249.misc

contrib/cmdclient/http.py

contrib/experiments/cursesio.py

contrib/experiments/test_messaging.py

scripts-dev/hash_history.py

synapse/api/auth.py

synapse/api/auth_blocking.py

synapse/api/constants.py

synapse/api/errors.py

synapse/api/filtering.py

synapse/api/ratelimiting.py

synapse/api/room_versions.py

synapse/api/urls.py

synapse/app/_base.py

synapse/app/generic_worker.py

synapse/appservice/__init__.py

synapse/appservice/scheduler.py

synapse/config/_base.py

synapse/config/cache.py

synapse/config/key.py