fix clippy-beta

[Icxolu]

Dead code detection getting better and linted a case where our reexport of PyFunction

pyo3/src/types/mod.rs

Lines 25 to 26 in b2b5203

	#[cfg(all(not(Py_LIMITED_API), not(PyPy), not(GraalPy)))]
	pub use self::function::PyFunction;

has a more restrictive gate than its type definition

pyo3/src/types/function.rs

Lines 183 to 184 in b2b5203

	#[cfg(all(not(Py_LIMITED_API), not(all(PyPy, not(Py_3_8)))))]
	pub struct PyFunction(PyAny);

So that type is actually not nameable on PyPy 3.8+ but it was actually intended to be.

This updates the cfg on the reexport to reflect the cfgs on the type definition.

[davidhewitt]

Actually see #2542 - maybe we need to cfg the struct away on PyPy?

[Icxolu]

In #2838 you did re-enable it explicitly for PyPy 3.8+

[davidhewitt]

Ah right yes sorry 👍 🤣