fix(05-04): restore propose_state module-level re-export removed by ruff
The pre-commit ruff hook removed 'propose_state' as an unused import,
but it's a module-level patch target used by tests that monkeypatch
prefect.runner.runner.propose_state. Added noqa: F401 comment to
preserve it.
Co-authored-by: alex.s <alex.s@prefect.io>
Co-Authored-By: alex.s <ajstreed1@gmail.com>