The failed-TOTP handler shared the login request's xorm session, and the
login handler rolled that session back after a failed login. The status
change to StatusAccountLocked was silently discarded, so the account was
never locked regardless of how many failed TOTP attempts arrived.
HandleFailedTOTPAuth now opens its own session and commits independently
of the caller. The login handler rolls back its session before invoking
the handler so the lockout write can acquire a write lock on SQLite
shared-cache.
Also handles the Redis keyvalue backend returning the attempt counter as
a string instead of int64, which would have prevented the lockout path
from ever running on Redis.
See GHSA-fgfv-pv97-6cmj.
d435c50df3