FreshRSS upstream commit 476e57b reversed the concatenation order
of the bcrypt hash and nonce in the login challenge for safer
password evaluation. Update our challenge computation to match
the new hash+nonce order.
Retrieve the running Uptime Kuma version by authenticating over
Socket.IO and reading the info event. This adds a new login_socket
dataset field, the fetch_socket_info helper, and the python-socketio
and websocket-client dependencies.
