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aae4d0f3 - [red-knot] A `FunctionType` can be a subtype of `Callable` (but never the other way around) (#16970)

[red-knot] A `FunctionType` can be a subtype of `Callable` (but never the other way around) (#16970) ## Summary Partially fixes #16953 ## Test Plan Update is_subtype_of.md --------- Co-authored-by: Carl Meyer <carl@astral.sh>