Stop using "PyBytesObject.ob_shash" in Py3.11, where it is deprecated. It was...

Stop using "PyBytesObject.ob_shash" in Py3.11, where it is deprecated. It was just an optimisation that isn't very important for byte strings any more.

Closes https://github.com/cython/cython/issues/4721

Cython/Utility/StringTools.c

@@ -314,7 +314,7 @@ static CYTHON_INLINE int __Pyx_PyBytes_Equals(PyObject* s1, PyObject* s2, int eq
             return (equals == Py_EQ);
         } else {
             int result;
-#if CYTHON_USE_UNICODE_INTERNALS
+#if CYTHON_USE_UNICODE_INTERNALS && (PY_VERSION_HEX < 0x030B0000)
             Py_hash_t hash1, hash2;
             hash1 = ((PyBytesObject*)s1)->ob_shash;
             hash2 = ((PyBytesObject*)s2)->ob_shash;