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ec74f2d5 - Revert "[red-knot] Type narrowing for assertions (#17149)" (#17335)

Revert "[red-knot] Type narrowing for assertions (#17149)" (#17335) I merged #17149 without checking the ecosystem results, and it still caused a cycle panic in pybind11. Reverting for now until I fix that, so we don't lose the ecosystem signal on other PRs.