[v5] Deprecate in: ...

[davidkpiano]

For https://github.com/davidkpiano/xstate/projects/1#card-40695477

This PR deprecates the in: ... property for transitions. It is recommended to use stateIn() and stateNotIn() guard creators instead.

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Latest commit: f42c388

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@xstate/graph	Major
@xstate/immer	Major
@xstate/react	Major
@xstate/test	Major
@xstate/vue	Major

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[johtso]

I don't think there is a stateNotIn guard, instead you need to use not(stateIn(...)). I guess it's just the change note that's wrong?