py-pgproto

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Getting a lot of these errors when trying to build https://github.com/MagicStack/asyncpg on Python 3.12:

  asyncpg/pgproto/pgproto.c:40800:55: error: no member named 'ob_digit' in 'struct _longobject'
              const digit* digits = ((PyLongObject*)x)->ob_digit;
                                    ~~~~~~~~~~~~~~~~~~  ^
  asyncpg/pgproto/pgproto.c:40855:55: error: no member named 'ob_digit' in 'struct _longobject'
              const digit* digits = ((PyLongObject*)x)->ob_digit;
                                    ~~~~~~~~~~~~~~~~~~  ^
  asyncpg/pgproto/pgproto.c:41034:55: error: no member named 'ob_digit' in 'struct _longobject'
              const digit* digits = ((PyLongObject*)x)->ob_digit;
                                    ~~~~~~~~~~~~~~~~~~  ^

I believe this can be solved by converting ((PyLongObject*)x)->ob_digit to ((PyLongObject*)x)->long_value->ob_digit

Checking to see if cython 3.0.4 fixes this...

Upgrading cython to >=3.0.0 fixes this and no more compilation errors.