[issue46396] Typing: test invalid usages of `Concatenate`

[Nikita Sobolev]

Nikita Sobolev <mail at sobolevn.me> added the comment:

> So maybe that code could just be removed?

I see this trend in typing.py :)

I think it makes sense to make all new types (I still consider `ParamSpec` and `Concatenate` as new, desipte the fact they are already released in 3.10) as flexible as possible.

I will change my PR.

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