revlog: migrate from PyEval_CallObject to PyObject_Call

The former was deprecated in 3.9.0.

Differential Revision: https://phab.mercurial-scm.org/D9791

mercurial/cext/revlog.c

@@ -498,7 +498,7 b' static int check_filter(PyObject *filter'
 			return -1;
 		}
 
-		result = PyEval_CallObject(filter, arglist);
+		result = PyObject_Call(filter, arglist, NULL);
 		Py_DECREF(arglist);
 		if (!result) {
 			return -1;