library not compatible with Python 3.12

[gregorleban]

Currently installing the library on Python 3.12 fails with errors like:

      src/pybloomfilter.c: In function ‘__Pyx_PyInt_As_int’:
      src/pybloomfilter.c:12917:53: error: ‘PyLongObject’ {aka ‘struct _longobject’} has no member named ‘ob_digit’
      12917 |             const digit* digits = ((PyLongObject*)x)->ob_digit;
            |                                                     ^~
      src/pybloomfilter.c:12972:53: error: ‘PyLongObject’ {aka ‘struct _longobject’} has no member named ‘ob_digit’
      12972 |             const digit* digits = ((PyLongObject*)x)->ob_digit;
            |                                                     ^~

other libraries had similar issues and seem to have solved them:

cython/cython#5238

aio-libs/aiohttp#7229

Can the same solution be applied here?