deps: bump ruff from 0.16.8 to 0.16.9 - #7

State field 'currency' is required and has no default. Stored threads without a value for it fail validation at the next node. Repaired by set_default('currency', 'USD').

Node 'wait_for_manager_approval' is gone. Threads paused at it, or with pending work for it, will resume as if finished and it will never run. Repaired by rename_node('wait_for_manager_approval', 'manager_review').