Run Black. (#5482)

.buildkite/pipeline.yml

changelog.d/5482.misc

contrib/cmdclient/console.py

contrib/cmdclient/http.py

contrib/experiments/cursesio.py

contrib/experiments/test_messaging.py

contrib/graph/graph.py

contrib/graph/graph2.py

contrib/graph/graph3.py

contrib/jitsimeetbridge/jitsimeetbridge.py

contrib/scripts/kick_users.py

demo/webserver.py

docker/start.py

docs/sphinx/conf.py

pyproject.toml

scripts-dev/check_auth.py

scripts-dev/check_event_hash.py

scripts-dev/check_signature.py

scripts-dev/convert_server_keys.py

scripts-dev/definitions.py