BUG: Pandas doesn't build with Cython3.0 pre-release

[realead]

This line :

self.buf.data = self.values.data

will no longer build once Cython3.0 is released, due to this change: cython/cython@22a49f4#diff-24bcfc3298e43281fed97318a554550dL247.

data is no longer

ctypedef class numpy.ndarray [object PyArrayObject, check_size ignore]:
    ....
    char * data

but

ctypedef class numpy.ndarray [object PyArrayObject, check_size ignore]:
             ...
            @property
            cdef inline char* data(self) nogil:
                """The pointer to the data buffer as a char*.
                This is provided for legacy reasons to avoid direct struct field access.
                For new code that needs this access, you probably want to cast the result
                of `PyArray_DATA()` instead.
                """
                return PyArray_BYTES(self)

Error:

Error compiling Cython file:
    ------------------------------------------------------------
    ...
            self.buf.data = self.values.data    
    
    pandas\_libs\reduction.pyx:472:15: Assignment to a read-only property

Expected:

Should build.

[jreback]

dup of #34213

you are welcome to help on the linked prs and issues