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3a806eca - [`flake8-annotations`] Correct syntax for `typing.Union` in suggested return type fixes for `ANN20x` rules (#16025)

[`flake8-annotations`] Correct syntax for `typing.Union` in suggested return type fixes for `ANN20x` rules (#16025) When suggesting a return type as a union in Python <=3.9, we now avoid a `TypeError` by correctly suggesting syntax like `Union[int,str,None]` instead of `Union[int | str | None]`.