9.1
upgrade-zulip-stage-2: Be more specific about OS upgrade steps.
thumbnail: Add support for multiple queue workers.
flush-memcached: Explicitly close memcached connection.
docs: Apply bullet style changes from Prettier.
Factor out venv-creating code from provision.py.
python: Normalize quotes with Black.
ruff: Fix UP035 Import from `collections.abc`, `typing` instead.
ruff: Fix UP006 Use `list` instead of `List` for type annotation.
sharding: Configure Tornado sharding with nginx map.
reload-clients: Log how many reload events were actually sent.
management: Disable Sentry for management commands run interactively.
start-server/restart-server: Drop privileges if necessary.
upgrade: Modify upgrade scripts to handle failure.